<SEC-DOCUMENT>0000067716-21-000010.txt : 20210312
<SEC-HEADER>0000067716-21-000010.hdr.sgml : 20210312
<ACCEPTANCE-DATETIME>20210312143320
ACCESSION NUMBER:		0000067716-21-000010
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		14
CONFORMED PERIOD OF REPORT:	20210309
ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20210312
DATE AS OF CHANGE:		20210312

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDU RESOURCES GROUP INC
		CENTRAL INDEX KEY:			0000067716
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				301133956
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03480
		FILM NUMBER:		21736754

	BUSINESS ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503
		BUSINESS PHONE:		701-530-1000

	MAIL ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MONTANA DAKOTA UTILITIES CO
		DATE OF NAME CHANGE:	19850429
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>mdu-20210309.htm
<DESCRIPTION>8-K
<TEXT>
<XBRL>
<?xml version="1.0" ?><!--XBRL Document Created with Wdesk from Workiva--><!--Copyright 2021 Workiva--><!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54,d:1cef08a66b8646ffae37e42c80ca3882--><html xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ix="http://www.xbrl.org/2013/inlineXBRL" xmlns="http://www.w3.org/1999/xhtml" xmlns:ixt="http://www.xbrl.org/inlineXBRL/transformation/2015-02-26" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31" xmlns:ixt-sec="http://www.sec.gov/inlineXBRL/transformation/2015-08-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xml:lang="en-US"><head><meta http-equiv="Content-Type" content="text/html"/>


<title>mdu-20210309</title></head><body><div style="display:none"><ix:header><ix:hidden><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityCentralIndexKey" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8xNTYvZnJhZzpkZTljMjBiMzg2YzM0MWU0YmUzZmQxNDQ5MzM2YjAzMy90YWJsZTozY2FkNTA2YWZkNDc0OGRjOGVlMDMxNTZlOTZmYzAxMi90YWJsZXJhbmdlOjNjYWQ1MDZhZmQ0NzQ4ZGM4ZWUwMzE1NmU5NmZjMDEyXzMtMS0xLTEtMzU5_0509050a-98ee-4bd9-9818-ff5984940041">0000067716</ix:nonNumeric><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:AmendmentFlag" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8xNTYvZnJhZzpkZTljMjBiMzg2YzM0MWU0YmUzZmQxNDQ5MzM2YjAzMy90YWJsZTozY2FkNTA2YWZkNDc0OGRjOGVlMDMxNTZlOTZmYzAxMi90YWJsZXJhbmdlOjNjYWQ1MDZhZmQ0NzQ4ZGM4ZWUwMzE1NmU5NmZjMDEyXzQtMS0xLTEtMzYy_48ab204a-4ff3-4766-93cd-d6fafe46a9d8">false</ix:nonNumeric></ix:hidden><ix:references xml:lang="en-US"><link:schemaRef xlink:type="simple" xlink:href="mdu-20210309.xsd"></link:schemaRef></ix:references><ix:resources><xbrli:context id="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000067716</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2021-03-09</xbrli:startDate><xbrli:endDate>2021-03-09</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div><div id="i1cef08a66b8646ffae37e42c80ca3882_32"></div><div style="min-height:45pt;width:100%"><div><span><br/></span></div></div><div style="-sec-extract:summary;margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:15pt;font-weight:700;line-height:120%">UNITED STATES SECURITIES AND EXCHANGE COMMISSION</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">WASHINGTON, D.C. 20549</span></div><div><span><br/></span></div><div style="margin-bottom:9pt;margin-top:9pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:100%">FORM <ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:DocumentType" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3MA_bc76fc01-0538-4d9e-ba8c-2736a0ef3a69">8-K</ix:nonNumeric> </span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">CURRENT REPORT</span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:100%">PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES </span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:100%">EXCHANGE ACT OF 1934</span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Date of Report (Date of earliest event reported):  <ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt:datemonthdayyearen" name="dei:DocumentPeriodEndDate" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwNzk5NA_9ee18bff-d4eb-48db-898c-64b3dca6c5e7">March 9, 2021</ix:nonNumeric> </span></div><div style="text-align:center"><span><br/></span></div><div style="margin-top:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:20pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityRegistrantName" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3MQ_0457b9ca-7afc-4d9f-98dd-3a1de8530615">MDU Resources Group Inc</ix:nonNumeric> </span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">(Exact name of registrant as specified in its charter)</span></div><div style="text-align:center"><span><br/></span></div><div style="margin-top:2pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:482.25pt"><tr><td style="width:1.0pt"></td><td style="width:157.75pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:159.25pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:159.25pt"></td><td style="width:1.0pt"></td></tr><tr style="height:12pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(State or other jurisdiction of</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(Commission File Number)</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(I.R.S. Employer Identification&#160;No.)</span></td></tr><tr style="height:12pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">incorporation)</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:stateprovnameen" name="dei:EntityIncorporationStateCountryCode" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0wLTEtMS0yOTc_87b1f579-96a4-4870-828e-0fad0023a778">Delaware</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityFileNumber" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0xLTEtMS0zMDE_95dd32b8-c790-4cb8-80ef-42dcd6fbbb9a">1-03480</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityTaxIdentificationNumber" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0yLTEtMS0zMDM_1c7f2db3-dd61-403e-abca-f2c03d41b0cc">30-1133956</ix:nonNumeric></span></td></tr></table></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityAddressAddressLine1" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Mg_b71a52c1-bfc1-4789-8ef2-97e66a899dbe">1200 West Century Avenue</ix:nonNumeric></span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityAddressAddressLine2" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Mw_0fe5179a-5876-4bad-abb2-6192040938d6">P.O. Box 5650</ix:nonNumeric></span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityAddressCityOrTown" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3NA_16c25143-4a38-4b02-9390-86effe00b2fa">Bismarck</ix:nonNumeric>, <ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:stateprovnameen" name="dei:EntityAddressStateOrProvince" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3NQ_e3267ba2-ae6e-4ab0-95f5-0b8b9075b2cf">North Dakota</ix:nonNumeric></span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:120%">  </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> <ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:EntityAddressPostalZipCode" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Ng_930aa1ca-f98e-4359-be5e-bd8dcbb1a709">58506-5650</ix:nonNumeric></span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:120%">(Address of principal executive offices)</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:120%">(Zip Code)</span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Registrant&#8217;s telephone number, including area code (<ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:CityAreaCode" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Nw_aa7f2976-52f8-42f3-8363-2fa3e3b003bf">701</ix:nonNumeric>) <ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:LocalPhoneNumber" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3OA_d8012438-385d-4ea2-85d8-db5232f2b78e">530-1000</ix:nonNumeric></span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> </span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:482.25pt"><tr><td style="width:1.0pt"></td><td style="width:16.00pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:16.00pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:444.25pt"></td><td style="width:1.0pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:boolballotbox" name="dei:WrittenCommunications" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMC0xLTEtMS0zMjY_4d35bcdc-99ee-44dc-9750-84d03ca59815">&#9744;</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:boolballotbox" name="dei:SolicitingMaterial" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMS0xLTEtMS0zMjk_a0ecdbe4-4d36-42ee-907e-f44ebebcc21a">&#9744;</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></td></tr><tr style="height:23pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:boolballotbox" name="dei:PreCommencementTenderOffer" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMi0xLTEtMS0zMzE_92a54129-7602-4a14-90f4-14f760fcc6d3">&#9744;</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></td></tr><tr style="height:23pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:boolballotbox" name="dei:PreCommencementIssuerTenderOffer" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMy0xLTEtMS0zMzM_0914607f-5f5a-4290-a116-80a9579012a6">&#9744;</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></div></td></tr></table></div><div style="text-align:center"><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:</span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:504.00pt"><tr><td style="width:1.0pt"></td><td style="width:196.75pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:97.75pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:203.50pt"></td><td style="width:1.0pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(Title of each class)</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(Trading Symbol(s))</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(Name of each exchange on which registered)</span></td></tr><tr style="height:14pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:Security12bTitle" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0wLTEtMS0zMzU_fbe0a455-8f92-4e82-b37d-aa403578a185">Common Stock, par value $1.00 per share</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" name="dei:TradingSymbol" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0xLTEtMS0zMzg_dd9c10d0-92f7-48d8-b398-04579e8716d9">MDU</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0yLTEtMS0zNDA_6622fc00-c4ba-437d-aa2d-dfd09fecd5c7">New York Stock Exchange</ix:nonNumeric></span></td></tr></table></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.</span></div><div style="margin-top:3pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Emerging growth company </span><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309" format="ixt-sec:boolballotbox" name="dei:EntityEmergingGrowthCompany" id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODE4OQ_1c0e7c07-b565-48ee-9b0f-97d1b2db4cd7">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="margin-top:3pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. </span><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#9744;</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="-sec-extract:summary;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">1</span></div></div></div><div id="i1cef08a66b8646ffae37e42c80ca3882_75"></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div><span><br/></span></div></div><div style="-sec-extract:summary;margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:174%">Item 5.02.  Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.</span></div><div><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:174%">On March 9, 2021, John K. Wilson, a member of the Board of Directors (the &#8220;Board&#8221;) of MDU Resources Group, Inc. (the &#8220;Company&#8221;) informed the Chair of the Board of his decision not to stand for reelection to the Board. Mr. Wilson&#8217;s term as a director will expire at the Company&#8217;s 2021 Annual Stockholder&#8217;s Meeting.  Mr. Wilson&#8217;s decision not to stand for reelection is not the result of a disagreement with the Company on any matter relating to the Company&#8217;s operations, policies or practices.</span></div><div style="text-align:justify;text-indent:36pt"><span><br/></span></div><div style="text-indent:36pt"><span><br/></span></div><div><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:115%">Item 9.01.</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:115%">     </span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:115%">Financial Statements and Exhibits.</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:115%">  </span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:115%">   </span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:115%">(d)  Exhibits. </span></div><div><span><br/></span></div><div><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:12.698%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:2.000%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:82.002%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Exhibit No.</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Description</span></td></tr><tr><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:115%">104</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt;text-align:left;text-indent:2.95pt;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:115%">Cover Page Interactive Data File (embedded within the Inline XBRL document)</span></td></tr></table></div><div style="height:72pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="-sec-extract:summary;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">2</span></div></div></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div><span><br/></span></div></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">SIGNATURE</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:174%">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">Date:  March 12, 2021 </span></div><div><span><br/></span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:46.893%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:3.992%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:45.815%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:100%">MDU Resources Group, Inc.</span></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:0 1pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">By:</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:115%">/s/ Karl A. Liepitz</span></div></td></tr><tr style="height:6pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:115%">Karl A. Liepitz</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Vice President, General Counsel</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">and Secretary</span></td></tr></table></div><div style="margin-top:3pt;text-indent:36pt"><span><br/></span></div><div style="height:72pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="-sec-extract:summary;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">3</span></div></div></div></body></html>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>2
<FILENAME>mdu-20210309.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:mdu="http://www.mdu.com/20210309" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.mdu.com/20210309">
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2020-01-31" schemaLocation="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mdu-20210309_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mdu-20210309_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mdu-20210309_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mdu-20210309_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.mdu.com/role/Cover">
        <link:definition>0001001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
</xs:schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.CAL
<SEQUENCE>3
<FILENAME>mdu-20210309_cal.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.mdu.com/role/Cover" xlink:type="simple" xlink:href="mdu-20210309.xsd#Cover"/>
  <link:calculationLink xlink:role="http://www.mdu.com/role/Cover" xlink:type="extended"/>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.DEF
<SEQUENCE>4
<FILENAME>mdu-20210309_def.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.mdu.com/role/Cover" xlink:type="simple" xlink:href="mdu-20210309.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.mdu.com/role/Cover" xlink:type="extended" id="id6e1a2eca4ad431ca2cdfaac253db201_Cover">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_ee9ce15b-30d6-4130-8bf3-6b27157811b1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_DocumentType_ee9ce15b-30d6-4130-8bf3-6b27157811b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_96bc802c-b80b-4b40-bb78-b4746d6f393e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_DocumentPeriodEndDate_96bc802c-b80b-4b40-bb78-b4746d6f393e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_7873e7c3-5dd2-4352-868d-eb460ee503ae" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityRegistrantName_7873e7c3-5dd2-4352-868d-eb460ee503ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_639e0ba3-0da7-4399-b855-7579f4818f74" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityIncorporationStateCountryCode_639e0ba3-0da7-4399-b855-7579f4818f74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_c2b65a6b-4cd9-4e42-8c54-04beab27b412" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityFileNumber_c2b65a6b-4cd9-4e42-8c54-04beab27b412" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_508fbf43-2d0a-46d1-969e-cf6064d8c105" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityTaxIdentificationNumber_508fbf43-2d0a-46d1-969e-cf6064d8c105" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_9251f455-5d93-4ec8-ad9c-3ef47b74c121" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressAddressLine1_9251f455-5d93-4ec8-ad9c-3ef47b74c121" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_831325c2-0066-4411-81ad-0cbad1dae39b" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressAddressLine2_831325c2-0066-4411-81ad-0cbad1dae39b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_57452c10-38d8-4e1e-93df-b92fc3d598c9" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressCityOrTown_57452c10-38d8-4e1e-93df-b92fc3d598c9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_a2a3b0d9-bd9b-4e2c-8123-d279697b37a3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressStateOrProvince_a2a3b0d9-bd9b-4e2c-8123-d279697b37a3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_d2437764-4175-4545-8ba5-57192993b721" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressPostalZipCode_d2437764-4175-4545-8ba5-57192993b721" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_b99a636e-4c87-4fd6-a010-f346cedfd3b3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_CityAreaCode_b99a636e-4c87-4fd6-a010-f346cedfd3b3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_b2705d2d-4b86-4aef-acb7-b7828063ce8f" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_LocalPhoneNumber_b2705d2d-4b86-4aef-acb7-b7828063ce8f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_57b162bd-372c-4124-a11a-45113047d770" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_WrittenCommunications_57b162bd-372c-4124-a11a-45113047d770" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_7ecc2c68-bdac-4184-b222-c41172bc82a3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_SolicitingMaterial_7ecc2c68-bdac-4184-b222-c41172bc82a3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_e08a167a-cd5c-414d-9cdf-7fd553f53813" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_PreCommencementTenderOffer_e08a167a-cd5c-414d-9cdf-7fd553f53813" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_ab1a32bf-127e-4d97-b669-5cbe90d9a9e3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_ab1a32bf-127e-4d97-b669-5cbe90d9a9e3" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_f941a463-d48f-4677-ae5b-6e2facee142e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_Security12bTitle_f941a463-d48f-4677-ae5b-6e2facee142e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_cca77d0a-6bbb-491f-a799-242a1b5b935e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_TradingSymbol_cca77d0a-6bbb-491f-a799-242a1b5b935e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_3895835b-44e9-4f9a-aaea-e72add70d1a6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_SecurityExchangeName_3895835b-44e9-4f9a-aaea-e72add70d1a6" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_6a8813b5-e353-4000-8eee-d10d8c3d2251" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityEmergingGrowthCompany_6a8813b5-e353-4000-8eee-d10d8c3d2251" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_e95a901e-eaf1-42ca-85d3-04f34af33326" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityCentralIndexKey_e95a901e-eaf1-42ca-85d3-04f34af33326" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_8af62fbd-f92d-4574-aa4a-7f1763ebf927" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_AmendmentFlag_8af62fbd-f92d-4574-aa4a-7f1763ebf927" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:to="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_15a38022-86e0-41c9-bde5-bb2ff7cdf415_default" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:to="loc_dei_EntityDomain_15a38022-86e0-41c9-bde5-bb2ff7cdf415_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c5b08dc3-1b63-4bf0-8c07-3d62e0d5e9ae" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:to="loc_dei_EntityDomain_c5b08dc3-1b63-4bf0-8c07-3d62e0d5e9ae" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>5
<FILENAME>mdu-20210309_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_dei_DocumentType_98f79f91-7767-4587-8ed4-7878f6ad067b_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType" xlink:to="lab_dei_DocumentType" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_8b36462b-3bc9-4d3e-ab56-c52156493dd8_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_label_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CityAreaCode_c80c23fd-a874-4c91-a12b-b2bf1ad880ac_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">City Area Code</link:label>
    <link:label id="lab_dei_CityAreaCode_label_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">City Area Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode" xlink:to="lab_dei_CityAreaCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LegalEntityAxis_c2dbc349-8051-408a-b219-6e35d6d3aa48_terseLabel_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:label id="lab_dei_LegalEntityAxis_label_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LegalEntityAxis" xlink:to="lab_dei_LegalEntityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressStateOrProvince_f1e874e5-7081-4f85-9256-559fa02030f7_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:label id="lab_dei_EntityAddressStateOrProvince_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SolicitingMaterial_b09c1c1a-9a93-44b9-a7b6-93eb54288acd_terseLabel_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Soliciting Material</link:label>
    <link:label id="lab_dei_SolicitingMaterial_label_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Soliciting Material</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SolicitingMaterial" xlink:to="lab_dei_SolicitingMaterial" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_f96781e1-cfaa-4282-9513-bc3416065baf_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_2cec9b54-ab11-4e9a-84bb-12103bf012c2_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityTaxIdentificationNumber" xlink:to="lab_dei_EntityTaxIdentificationNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementTenderOffer_84704cad-d816-4ac0-b9ea-db4ff58839d4_terseLabel_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementTenderOffer" xlink:to="lab_dei_PreCommencementTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntitiesTable_84c70528-9125-42b3-ad05-938ccb7e9bd9_terseLabel_en-US" xlink:label="lab_dei_EntitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entities [Table]</link:label>
    <link:label id="lab_dei_EntitiesTable_label_en-US" xlink:label="lab_dei_EntitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entities [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitiesTable" xlink:to="lab_dei_EntitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_22f163b9-fbf6-450e-a167-09389ccfcedb_terseLabel_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_label_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode" xlink:to="lab_dei_EntityIncorporationStateCountryCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_bceb5a60-f499-48f4-be0c-02950ca155c5_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_71f7efd7-d53f-49cd-8594-bf7fc0fc97bf_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_TradingSymbol_378f2c22-e55b-44d2-bf3e-f046f3761a4b_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_label_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol" xlink:to="lab_dei_TradingSymbol" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressPostalZipCode_d5bd9774-b51b-4e65-b9f4-328bad488f2f_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:label id="lab_dei_EntityAddressPostalZipCode_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode" xlink:to="lab_dei_EntityAddressPostalZipCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LocalPhoneNumber_f6d91c97-a7c6-4ca4-9396-6cda57800771_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Local Phone Number</link:label>
    <link:label id="lab_dei_LocalPhoneNumber_label_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Local Phone Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber" xlink:to="lab_dei_LocalPhoneNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_WrittenCommunications_680d682a-9973-4f37-b8a9-859e0bc372cb_terseLabel_en-US" xlink:label="lab_dei_WrittenCommunications" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Written Communications</link:label>
    <link:label id="lab_dei_WrittenCommunications_label_en-US" xlink:label="lab_dei_WrittenCommunications" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Written Communications</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_WrittenCommunications"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_WrittenCommunications" xlink:to="lab_dei_WrittenCommunications" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_fb78afda-8319-4873-9a1d-c2e7f04c4c73_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SecurityExchangeName_b5d90d21-d9c3-412f-b1e8-e4f8f6519523_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Security Exchange Name</link:label>
    <link:label id="lab_dei_SecurityExchangeName_label_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Security Exchange Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName" xlink:to="lab_dei_SecurityExchangeName" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityDomain_60c36fe5-cf1d-4a02-a1ae-aefc3a56c3ca_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_label_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain" xlink:to="lab_dei_EntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_a3bf84f4-b47e-42bc-a0f2-5bfe32904c8f_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_29aabb0b-503e-4097-ad02-54c80c4bdeed_terseLabel_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementIssuerTenderOffer" xlink:to="lab_dei_PreCommencementIssuerTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_9fde832b-0e3c-4ded-8d63-667525c1d5f1_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine2_72f29022-522f-445c-a3b6-d483e9615bdb_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line Two</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine2_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine2" xlink:to="lab_dei_EntityAddressAddressLine2" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_4f46ebf1-d937-4c7b-bb56-d412d2eb2747_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany" xlink:to="lab_dei_EntityEmergingGrowthCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_22f15fba-efa9-4ab6-90e4-a648cbc90926_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInformationLineItems_5c0b5d9f-0bf6-4826-b2ce-53738e7363ea_terseLabel_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:label id="lab_dei_EntityInformationLineItems_label_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInformationLineItems" xlink:to="lab_dei_EntityInformationLineItems" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>6
<FILENAME>mdu-20210309_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:57c77d97-c6a1-46ef-8a64-64bff06abe0f,g:36f5a3c5-6152-4018-be76-acdf9d0a5a54-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.mdu.com/role/Cover" xlink:type="simple" xlink:href="mdu-20210309.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.mdu.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_8f9d7c7f-bf13-44e5-954f-94693fc0b664" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_8f9d7c7f-bf13-44e5-954f-94693fc0b664" xlink:to="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:to="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c5b08dc3-1b63-4bf0-8c07-3d62e0d5e9ae" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_15a38022-86e0-41c9-bde5-bb2ff7cdf415" xlink:to="loc_dei_EntityDomain_c5b08dc3-1b63-4bf0-8c07-3d62e0d5e9ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_dc142a13-12cb-4f89-8179-bf256376861e" xlink:to="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_ee9ce15b-30d6-4130-8bf3-6b27157811b1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_DocumentType_ee9ce15b-30d6-4130-8bf3-6b27157811b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_96bc802c-b80b-4b40-bb78-b4746d6f393e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_DocumentPeriodEndDate_96bc802c-b80b-4b40-bb78-b4746d6f393e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_7873e7c3-5dd2-4352-868d-eb460ee503ae" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityRegistrantName_7873e7c3-5dd2-4352-868d-eb460ee503ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_639e0ba3-0da7-4399-b855-7579f4818f74" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityIncorporationStateCountryCode_639e0ba3-0da7-4399-b855-7579f4818f74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_c2b65a6b-4cd9-4e42-8c54-04beab27b412" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityFileNumber_c2b65a6b-4cd9-4e42-8c54-04beab27b412" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_508fbf43-2d0a-46d1-969e-cf6064d8c105" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityTaxIdentificationNumber_508fbf43-2d0a-46d1-969e-cf6064d8c105" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_9251f455-5d93-4ec8-ad9c-3ef47b74c121" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressAddressLine1_9251f455-5d93-4ec8-ad9c-3ef47b74c121" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_831325c2-0066-4411-81ad-0cbad1dae39b" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressAddressLine2_831325c2-0066-4411-81ad-0cbad1dae39b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_57452c10-38d8-4e1e-93df-b92fc3d598c9" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressCityOrTown_57452c10-38d8-4e1e-93df-b92fc3d598c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_a2a3b0d9-bd9b-4e2c-8123-d279697b37a3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressStateOrProvince_a2a3b0d9-bd9b-4e2c-8123-d279697b37a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_d2437764-4175-4545-8ba5-57192993b721" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityAddressPostalZipCode_d2437764-4175-4545-8ba5-57192993b721" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_b99a636e-4c87-4fd6-a010-f346cedfd3b3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_CityAreaCode_b99a636e-4c87-4fd6-a010-f346cedfd3b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_b2705d2d-4b86-4aef-acb7-b7828063ce8f" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_LocalPhoneNumber_b2705d2d-4b86-4aef-acb7-b7828063ce8f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_57b162bd-372c-4124-a11a-45113047d770" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_WrittenCommunications_57b162bd-372c-4124-a11a-45113047d770" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_7ecc2c68-bdac-4184-b222-c41172bc82a3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_SolicitingMaterial_7ecc2c68-bdac-4184-b222-c41172bc82a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_e08a167a-cd5c-414d-9cdf-7fd553f53813" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_PreCommencementTenderOffer_e08a167a-cd5c-414d-9cdf-7fd553f53813" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_ab1a32bf-127e-4d97-b669-5cbe90d9a9e3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_ab1a32bf-127e-4d97-b669-5cbe90d9a9e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_f941a463-d48f-4677-ae5b-6e2facee142e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_Security12bTitle_f941a463-d48f-4677-ae5b-6e2facee142e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_cca77d0a-6bbb-491f-a799-242a1b5b935e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_TradingSymbol_cca77d0a-6bbb-491f-a799-242a1b5b935e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_3895835b-44e9-4f9a-aaea-e72add70d1a6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_SecurityExchangeName_3895835b-44e9-4f9a-aaea-e72add70d1a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_6a8813b5-e353-4000-8eee-d10d8c3d2251" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityEmergingGrowthCompany_6a8813b5-e353-4000-8eee-d10d8c3d2251" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_e95a901e-eaf1-42ca-85d3-04f34af33326" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_EntityCentralIndexKey_e95a901e-eaf1-42ca-85d3-04f34af33326" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_8af62fbd-f92d-4574-aa4a-7f1763ebf927" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_336dedf2-34d1-4f38-b18b-0a4f13974d49" xlink:to="loc_dei_AmendmentFlag_8af62fbd-f92d-4574-aa4a-7f1763ebf927" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>7
<FILENAME>mdu-20210309_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="mdu-20210309.xsd" xlink:type="simple"/>
    <context id="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000067716</identifier>
        </entity>
        <period>
            <startDate>2021-03-09</startDate>
            <endDate>2021-03-09</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8xNTYvZnJhZzpkZTljMjBiMzg2YzM0MWU0YmUzZmQxNDQ5MzM2YjAzMy90YWJsZTozY2FkNTA2YWZkNDc0OGRjOGVlMDMxNTZlOTZmYzAxMi90YWJsZXJhbmdlOjNjYWQ1MDZhZmQ0NzQ4ZGM4ZWUwMzE1NmU5NmZjMDEyXzMtMS0xLTEtMzU5_0509050a-98ee-4bd9-9818-ff5984940041">0000067716</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8xNTYvZnJhZzpkZTljMjBiMzg2YzM0MWU0YmUzZmQxNDQ5MzM2YjAzMy90YWJsZTozY2FkNTA2YWZkNDc0OGRjOGVlMDMxNTZlOTZmYzAxMi90YWJsZXJhbmdlOjNjYWQ1MDZhZmQ0NzQ4ZGM4ZWUwMzE1NmU5NmZjMDEyXzQtMS0xLTEtMzYy_48ab204a-4ff3-4766-93cd-d6fafe46a9d8">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3MA_bc76fc01-0538-4d9e-ba8c-2736a0ef3a69">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwNzk5NA_9ee18bff-d4eb-48db-898c-64b3dca6c5e7">2021-03-09</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3MQ_0457b9ca-7afc-4d9f-98dd-3a1de8530615">MDU Resources Group Inc</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0wLTEtMS0yOTc_87b1f579-96a4-4870-828e-0fad0023a778">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0xLTEtMS0zMDE_95dd32b8-c790-4cb8-80ef-42dcd6fbbb9a">1-03480</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmZmZDRhMTk5YjQ5NjQ3NmJiMGZhZWFkN2ZiZmFhNWY2L3RhYmxlcmFuZ2U6ZmZkNGExOTliNDk2NDc2YmIwZmFlYWQ3ZmJmYWE1ZjZfMi0yLTEtMS0zMDM_1c7f2db3-dd61-403e-abca-f2c03d41b0cc">30-1133956</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Mg_b71a52c1-bfc1-4789-8ef2-97e66a899dbe">1200 West Century Avenue</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Mw_0fe5179a-5876-4bad-abb2-6192040938d6">P.O. Box 5650</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3NA_16c25143-4a38-4b02-9390-86effe00b2fa">Bismarck</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3NQ_e3267ba2-ae6e-4ab0-95f5-0b8b9075b2cf">ND</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Ng_930aa1ca-f98e-4359-be5e-bd8dcbb1a709">58506-5650</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3Nw_aa7f2976-52f8-42f3-8363-2fa3e3b003bf">701</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODA3OA_d8012438-385d-4ea2-85d8-db5232f2b78e">530-1000</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMC0xLTEtMS0zMjY_4d35bcdc-99ee-44dc-9750-84d03ca59815">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMS0xLTEtMS0zMjk_a0ecdbe4-4d36-42ee-907e-f44ebebcc21a">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMi0xLTEtMS0zMzE_92a54129-7602-4a14-90f4-14f760fcc6d3">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOjU0MzUyMzhmOTg2OTQ3MDlhYTBiNDJjNzU1NTlkOTFiL3RhYmxlcmFuZ2U6NTQzNTIzOGY5ODY5NDcwOWFhMGI0MmM3NTU1OWQ5MWJfMy0xLTEtMS0zMzM_0914607f-5f5a-4290-a116-80a9579012a6">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0wLTEtMS0zMzU_fbe0a455-8f92-4e82-b37d-aa403578a185">Common Stock, par value $1.00 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0xLTEtMS0zMzg_dd9c10d0-92f7-48d8-b398-04579e8716d9">MDU</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RhYmxlOmY1ZmQxNmExNDM1MDRiY2Q4OWVlMzkyMDE5ODI2M2Y3L3RhYmxlcmFuZ2U6ZjVmZDE2YTE0MzUwNGJjZDg5ZWUzOTIwMTk4MjYzZjdfMS0yLTEtMS0zNDA_6622fc00-c4ba-437d-aa2d-dfd09fecd5c7">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309"
      id="id3VybDovL2RvY3MudjEvZG9jOjFjZWYwOGE2NmI4NjQ2ZmZhZTM3ZTQyYzgwY2EzODgyL3NlYzoxY2VmMDhhNjZiODY0NmZmYWUzN2U0MmM4MGNhMzg4Ml8zMi9mcmFnOjY0ODk1OTVhZGYwYjRjZWZhYmNjYjY1NTllZWIzMDI0L3RleHRyZWdpb246NjQ4OTU5NWFkZjBiNGNlZmFiY2NiNjU1OWVlYjMwMjRfMzI5ODUzNDkwODE4OQ_1c0e7c07-b565-48ee-9b0f-97d1b2db4cd7">false</dei:EntityEmergingGrowthCompany>
</xbrl>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm140426924740728">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Mar. 09, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Mar.  09,  2021<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">MDU Resources Group Inc<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">1-03480<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">30-1133956<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">1200 West Century Avenue<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine2', window );">Entity Address, Address Line Two</a></td>
<td class="text">P.O. Box 5650<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Bismarck<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">ND<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">58506-5650<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">701<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">530-1000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, par value $1.00 per share<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MDU<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000067716<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 2 such as Street or Suite number</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityInformationLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityInformationLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>9
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 Financial_Report.xlsx
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MPIY49M"8TQ-E1=88O3.O:21\*5= +ESF] .7HG1BKN5*R"G2:2 J(XTCZ*U
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M$<+NOS^QO-9.&G_FB^$_7G\!4$L! A0#%     @ *71L4@=!36*!    L0
M !               ( !     &1O8U!R;W!S+V%P<"YX;6Q02P$"% ,4
M"  I=&Q2RD\7 NX    K @  $0              @ &O    9&]C4')O<',O
M8V]R92YX;6Q02P$"% ,4    "  I=&Q2F5R<(Q &  "<)P  $P
M    @ ', 0  >&PO=&AE;64O=&AE;64Q+GAM;%!+ 0(4 Q0    ( "ET;%*E
M9)QZ5 0  .H0   8              " @0T(  !X;"]W;W)K<VAE971S+W-H
M965T,2YX;6Q02P$"% ,4    "  I=&Q2@ZFE ]0!   R!@  #0
M    @ &7#   >&PO<W1Y;&5S+GAM;%!+ 0(4 Q0    ( "ET;%*7BKL<P
M !,"   +              "  98.  !?<F5L<R\N<F5L<U!+ 0(4 Q0    (
M "ET;%*JQ"(6,P$  "("   /              "  7\/  !X;"]W;W)K8F]O
M:RYX;6Q02P$"% ,4    "  I=&Q2)!Z;HJT   #X 0  &@
M@ '?$   >&PO7W)E;',O=V]R:V)O;VLN>&UL+G)E;'-02P$"% ,4    "  I
M=&Q299!YDAD!  #/ P  $P              @ '$$0  6T-O;G1E;G1?5'EP
=97-=+GAM;%!+!08     "0 ) #X"   .$P     !

end
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>10
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
// Edgar(tm) Renderer was created by staff of the U.S. Securities and Exchange Commission.  Data and content created by government employees within the scope of their employment are not subject to domestic copyright protection. 17 U.S.C. 105.
var Show={};Show.LastAR=null,Show.showAR=function(a,r,w){if(Show.LastAR)Show.hideAR();var e=a;while(e&&e.nodeName!='TABLE')e=e.nextSibling;if(!e||e.nodeName!='TABLE'){var ref=((window)?w.document:document).getElementById(r);if(ref){e=ref.cloneNode(!0);
e.removeAttribute('id');a.parentNode.appendChild(e)}}
if(e)e.style.display='block';Show.LastAR=e};Show.hideAR=function(){Show.LastAR.style.display='none'};Show.toggleNext=function(a){var e=a;while(e.nodeName!='DIV')e=e.nextSibling;if(!e.style){}else if(!e.style.display){}else{var d,p_;if(e.style.display=='none'){d='block';p='-'}else{d='none';p='+'}
e.style.display=d;if(a.textContent){a.textContent=p+a.textContent.substring(1)}else{a.innerText=p+a.innerText.substring(1)}}}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>11
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
/* Updated 2009-11-04 */
/* v2.2.0.24 */

/* DefRef Styles */
..report table.authRefData{
	background-color: #def;
	border: 2px solid #2F4497;
	font-size: 1em;
	position: absolute;
}

..report table.authRefData a {
	display: block;
	font-weight: bold;
}

..report table.authRefData p {
	margin-top: 0px;
}

..report table.authRefData .hide {
	background-color: #2F4497;
	padding: 1px 3px 0px 0px;
	text-align: right;
}

..report table.authRefData .hide a:hover {
	background-color: #2F4497;
}

..report table.authRefData .body {
	height: 150px;
	overflow: auto;
	width: 400px;
}

..report table.authRefData table{
	font-size: 1em;
}

/* Report Styles */
..pl a, .pl a:visited {
	color: black;
	text-decoration: none;
}

/* table */
..report {
	background-color: white;
	border: 2px solid #acf;
	clear: both;
	color: black;
	font: normal 8pt Helvetica, Arial, san-serif;
	margin-bottom: 2em;
}

..report hr {
	border: 1px solid #acf;
}

/* Top labels */
..report th {
	background-color: #acf;
	color: black;
	font-weight: bold;
	text-align: center;
}

..report th.void	{
	background-color: transparent;
	color: #000000;
	font: bold 10pt Helvetica, Arial, san-serif;
	text-align: left;
}

..report .pl {
	text-align: left;
	vertical-align: top;
	white-space: normal;
	width: 200px;
	white-space: normal; /* word-wrap: break-word; */
}

..report td.pl a.a {
	cursor: pointer;
	display: block;
	width: 200px;
	overflow: hidden;
}

..report td.pl div.a {
	width: 200px;
}

..report td.pl a:hover {
	background-color: #ffc;
}

/* Header rows... */
..report tr.rh {
	background-color: #acf;
	color: black;
	font-weight: bold;
}

/* Calendars... */
..report .rc {
	background-color: #f0f0f0;
}

/* Even rows... */
..report .re, .report .reu {
	background-color: #def;
}

..report .reu td {
	border-bottom: 1px solid black;
}

/* Odd rows... */
..report .ro, .report .rou {
	background-color: white;
}

..report .rou td {
	border-bottom: 1px solid black;
}

..report .rou table td, .report .reu table td {
	border-bottom: 0px solid black;
}

/* styles for footnote marker */
..report .fn {
	white-space: nowrap;
}

/* styles for numeric types */
..report .num, .report .nump {
	text-align: right;
	white-space: nowrap;
}

..report .nump {
	padding-left: 2em;
}

..report .nump {
	padding: 0px 0.4em 0px 2em;
}

/* styles for text types */
..report .text {
	text-align: left;
	white-space: normal;
}

..report .text .big {
	margin-bottom: 1em;
	width: 17em;
}

..report .text .more {
	display: none;
}

..report .text .note {
	font-style: italic;
	font-weight: bold;
}

..report .text .small {
	width: 10em;
}

..report sup {
	font-style: italic;
}

..report .outerFootnotes {
	font-size: 1em;
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>12
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1</ContextCount>
  <ElementCount>96</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>0</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>0</UnitCount>
  <MyReports>
    <Report instance="mdu-20210309.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mdu.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="8-K" original="mdu-20210309.htm">mdu-20210309.htm</File>
    <File>mdu-20210309.xsd</File>
    <File>mdu-20210309_cal.xml</File>
    <File>mdu-20210309_def.xml</File>
    <File>mdu-20210309_lab.xml</File>
    <File>mdu-20210309_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>14
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
{
 "instance": {
  "mdu-20210309.htm": {
   "axisCustom": 0,
   "axisStandard": 0,
   "contextCount": 1,
   "dts": {
    "calculationLink": {
     "local": [
      "mdu-20210309_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "mdu-20210309_def.xml"
     ]
    },
    "inline": {
     "local": [
      "mdu-20210309.htm"
     ]
    },
    "labelLink": {
     "local": [
      "mdu-20210309_lab.xml"
     ],
     "remote": [
      "https://xbrl.sec.gov/dei/2020/dei-doc-2020-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "mdu-20210309_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "https://xbrl.sec.gov/dei/2020/dei-ref-2020-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "mdu-20210309.xsd"
     ],
     "remote": [
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd"
     ]
    }
   },
   "elementCount": 28,
   "entityCount": 1,
   "hidden": {
    "http://xbrl.sec.gov/dei/2020-01-31": 2,
    "total": 2
   },
   "keyCustom": 0,
   "keyStandard": 96,
   "memberCustom": 0,
   "memberStandard": 0,
   "nsprefix": "mdu",
   "nsuri": "http://www.mdu.com/20210309",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "mdu-20210309.htm",
      "contextRef": "i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "0001001 - Document - Cover",
     "role": "http://www.mdu.com/role/Cover",
     "shortName": "Cover",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "mdu-20210309.htm",
      "contextRef": "i42f29d9db1cb4703968e90697c9c45f6_D20210309-20210309",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 0,
   "tag": {
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cover page.",
        "label": "Cover [Abstract]"
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntitiesTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Container to assemble all relevant information about each entity associated with the document instance",
        "label": "Entities [Table]",
        "terseLabel": "Entities [Table]"
       }
      }
     },
     "localname": "EntitiesTable",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressAddressLine2": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Address Line 2 such as Street or Suite number",
        "label": "Entity Address, Address Line Two",
        "terseLabel": "Entity Address, Address Line Two"
       }
      }
     },
     "localname": "EntityAddressAddressLine2",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]",
        "terseLabel": "Entity [Domain]"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Entity Information [Line Items]",
        "terseLabel": "Entity Information [Line Items]"
       }
      }
     },
     "localname": "EntityInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]",
        "terseLabel": "Legal Entity [Axis]"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_PreCommencementIssuerTenderOffer": {
     "auth_ref": [
      "r2"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.",
        "label": "Pre-commencement Issuer Tender Offer",
        "terseLabel": "Pre-commencement Issuer Tender Offer"
       }
      }
     },
     "localname": "PreCommencementIssuerTenderOffer",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_PreCommencementTenderOffer": {
     "auth_ref": [
      "r3"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.",
        "label": "Pre-commencement Tender Offer",
        "terseLabel": "Pre-commencement Tender Offer"
       }
      }
     },
     "localname": "PreCommencementTenderOffer",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security",
        "terseLabel": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r1"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name",
        "terseLabel": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_SolicitingMaterial": {
     "auth_ref": [
      "r4"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.",
        "label": "Soliciting Material",
        "terseLabel": "Soliciting Material"
       }
      }
     },
     "localname": "SolicitingMaterial",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol",
        "terseLabel": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "dei_WrittenCommunications": {
     "auth_ref": [
      "r6"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.",
        "label": "Written Communications",
        "terseLabel": "Written Communications"
       }
      }
     },
     "localname": "WrittenCommunications",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.mdu.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    }
   },
   "unitCount": 0
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r1": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r2": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13e",
   "Subsection": "4c"
  },
  "r3": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14d",
   "Subsection": "2b"
  },
  "r4": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14a",
   "Subsection": "12"
  },
  "r5": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r6": {
   "Name": "Securities Act",
   "Number": "230",
   "Publisher": "SEC",
   "Section": "425"
  }
 },
 "version": "2.1"
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>15
<FILENAME>0000067716-21-000010-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 0000067716-21-000010-xbrl.zip
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M6)[H,(G'(]2,W!_GTFWCZ;O&% S2G"L$C"97W(!HBM(1=X7QSY ?(3]+D3L
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MW.T(J#@QF\%_@RP,]OX?4$L#!!0    ( "ET;%)HAU\0@P(  &,)   0
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M?^@B?]A;_N_FLKA*LZM_%?E=>:TKC1N:/4R10I%DJGI@$\8 \9@!5KW(6:
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M=2TR,#(Q,#,P.2YH=&U02P$"% ,4    "  I=&Q2:(=?$(,"  !C"0  $
M            @ &@%   ;61U+3(P,C$P,S Y+GAS9%!+ 0(4 Q0    ( "ET
M;%)8V(*\?0$  +L"   4              "  5$7  !M9'4M,C R,3 S,#E?
M8V%L+GAM;%!+ 0(4 Q0    ( "ET;%*M!T^/$@@  %(Z   4
M  "  0 9  !M9'4M,C R,3 S,#E?9&5F+GAM;%!+ 0(4 Q0    ( "ET;%(5
M] ,D_0L  "]P   4              "  40A  !M9'4M,C R,3 S,#E?;&%B
M+GAM;%!+ 0(4 Q0    ( "ET;%*&^Q9;FP<  +X\   4              "
M 7,M  !M9'4M,C R,3 S,#E?<')E+GAM;%!+!08     !@ & (0!  ! -0
"   !

end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
