<SEC-DOCUMENT>0001466593-22-000035.txt : 20220523
<SEC-HEADER>0001466593-22-000035.hdr.sgml : 20220523
<ACCEPTANCE-DATETIME>20220523114910
ACCESSION NUMBER:		0001466593-22-000035
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		12
CONFORMED PERIOD OF REPORT:	20220520
ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
FILED AS OF DATE:		20220523
DATE AS OF CHANGE:		20220523

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Otter Tail Corp
		CENTRAL INDEX KEY:			0001466593
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				270383995
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-53713
		FILM NUMBER:		22950381

	BUSINESS ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496
		BUSINESS PHONE:		866-410-8780

	MAIL ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Otter Tail Holding Co
		DATE OF NAME CHANGE:	20090618
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>ottr-20220520.htm
<DESCRIPTION>8-K
<TEXT>
<XBRL>
<?xml version="1.0" ?><!--XBRL Document Created with Wdesk from Workiva--><!--Copyright 2022 Workiva--><!--r:0825e866-3336-45e4-a661-1966e57f8a81,g:bcd2867e-9e84-47f9-a09d-846b9821b0cd,d:b0bace4228984774acf68b5e7da55def--><html xmlns="http://www.w3.org/1999/xhtml" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ixt-sec="http://www.sec.gov/inlineXBRL/transformation/2015-08-31" xmlns:ix="http://www.xbrl.org/2013/inlineXBRL" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ixt="http://www.xbrl.org/inlineXBRL/transformation/2020-02-12" xmlns:dei="http://xbrl.sec.gov/dei/2021q4" xml:lang="en-US"><head><meta http-equiv="Content-Type" content="text/html"/>


<title>ottr-20220520</title></head><body><div style="display:none"><ix:header><ix:hidden><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityCentralIndexKey" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl80L2ZyYWc6YzQ2YTkwOTQ3ZDI2NGEzYWIzZDMwMDhlMGY0YTdhM2EvdGFibGU6ODkxYzNlYTU3MzA1NDVmNGE5NjVmY2E3ODIwY2ZiNTIvdGFibGVyYW5nZTo4OTFjM2VhNTczMDU0NWY0YTk2NWZjYTc4MjBjZmI1Ml8yLTEtMS0xLTEyNDMwNA_ee16ff18-1105-460e-a5ec-d4829ccb7b23">0001466593</ix:nonNumeric><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:AmendmentFlag" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl80L2ZyYWc6YzQ2YTkwOTQ3ZDI2NGEzYWIzZDMwMDhlMGY0YTdhM2EvdGFibGU6ODkxYzNlYTU3MzA1NDVmNGE5NjVmY2E3ODIwY2ZiNTIvdGFibGVyYW5nZTo4OTFjM2VhNTczMDU0NWY0YTk2NWZjYTc4MjBjZmI1Ml8zLTEtMS0xLTEyNDMwNA_b2b46581-938f-42e1-91bb-ea6ba464892c">false</ix:nonNumeric></ix:hidden><ix:references xml:lang="en-US"><link:schemaRef xlink:type="simple" xlink:href="ottr-20220520.xsd"></link:schemaRef></ix:references><ix:resources><xbrli:context id="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0001466593</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2022-05-20</xbrli:startDate><xbrli:endDate>2022-05-20</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div><div id="ib0bace4228984774acf68b5e7da55def_1"></div><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:12pt;font-weight:700;line-height:120%">UNITED STATES</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:12pt;font-weight:700;line-height:120%">SECURITIES AND EXCHANGE COMMISSION</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">WASHINGTON, D.C. 20549</span></div><div style="margin-top:9pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:18pt;font-weight:700;line-height:120%">FORM&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:DocumentType" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI2_1d148ba1-eeb1-44ed-8292-2629e89fb1fa">8-K</ix:nonNumeric></span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">CURRENT REPORT</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Date of report (Date of earliest event reported):&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:DocumentPeriodEndDate" format="ixt:date-monthname-day-year-en" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzA3_cc2bb569-fe52-4a62-8e0f-b8da260868ad">May 20, 2022</ix:nonNumeric></span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:24pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityRegistrantName" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI1_f4f8d889-26e2-4ca9-a3fa-701e8e3bd605">OTTER TAIL CORPORATION</ix:nonNumeric></span></div><div style="margin-bottom:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Exact name of registrant as specified in its charter)</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:32.233%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:32.233%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:32.234%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityIncorporationStateCountryCode" format="ixt-sec:stateprovnameen" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTAtMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjAzYTcyZGJhODE1MDQ3YmE5NTJlMzgyZDMyMGY1YTdiXzQ_9f7404cc-f4cb-4290-a203-356250bfec71">Minnesota</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(State or other jurisdiction of incorporation or organization)</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityFileNumber" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTEtMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjhjYWM0NjgzNjFlMjQxMmI5ZWIwOTBkNjk5MmI4NGEzXzQ_5aedf8c7-1473-470a-ac57-efcb1559e9a4">0-53713</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(Commission File Number)</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityTaxIdentificationNumber" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTItMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjA0MzVmZDczMjI1MzQzMzJiNTZmM2ZlZDNhNTk3MWNmXzQ_b8be0585-269f-42a4-a51d-437eae8d923c">27-0383995</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(I.R.S. Employer Identification No.)</span></div></td></tr></table></div><div style="margin-top:4pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityAddressAddressLine1" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE1_1001019e-c413-49c7-b300-8ef2d719cd92">215 South Cascade Street,&#160;P.O. Box 496</ix:nonNumeric>,&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityAddressCityOrTown" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEx_7f5a19f7-6803-4b35-9a63-8556ddd27b6e">Fergus Falls</ix:nonNumeric>,&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityAddressStateOrProvince" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIw_6b8a473b-0e63-4648-8d4a-6e916331c0dc">MN</ix:nonNumeric>&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityAddressPostalZipCode" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIx_92155d02-4e5f-4451-b537-74f5efb98ecb">56538-0496</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(Address of principal executive offices, including zip code)</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">(<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:CityAreaCode" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml80NTA_96b44ac7-4cf9-47c7-98f2-63e2cc4181db">866</ix:nonNumeric>)&#160;<ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:LocalPhoneNumber" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEy_9586feca-d2a8-4068-b3c8-f3a6e7d5473d">410-8780</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(Registrant&#8217;s telephone number, including area code)</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Not Applicable</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(Former name or former address, if changed since last report)</span></div><div style="margin-top:18pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;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:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:WrittenCommunications" format="ixt-sec:boolballotbox" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE0_6dd0a3a9-e923-45cf-98de-5f9f19b5a08f">&#9744;</ix:nonNumeric>&#160;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:SolicitingMaterial" format="ixt-sec:boolballotbox" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIy_2b63f0ad-a501-4ee8-8660-486576521f76">&#9744;</ix:nonNumeric>&#160;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:PreCommencementTenderOffer" format="ixt-sec:boolballotbox" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE3_956ab1bd-5ed3-4a54-8121-25687372dc9c">&#9744;</ix:nonNumeric>&#160;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:PreCommencementIssuerTenderOffer" format="ixt-sec:boolballotbox" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEz_5540df87-03b5-4bc4-9f0a-82601d2382b1">&#9744;</ix:nonNumeric>&#160;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:</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:37.094%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:22.511%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:37.095%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Title of each class</span></td><td colspan="3" style="border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Trading Symbol(s)</span></td><td colspan="3" style="border-left:1pt solid #000;border-right:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Name of each exchange on which registered</span></td></tr><tr><td colspan="3" style="border-bottom:1pt solid #000;border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:Security12bTitle" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTAtMS0xLTEyNDMwNA_66b09aec-83d2-4bc0-8bde-55149c0ed71d">Common Shares, par value $5.00 per share</ix:nonNumeric></span></td><td colspan="3" style="border-bottom:1pt solid #000;border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:TradingSymbol" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTEtMS0xLTEyNDMwNA_4c6f1c8b-6d6d-4fc0-8934-f200ec45a8d8">OTTR</ix:nonNumeric></span></td><td colspan="3" style="border-bottom:1pt solid #000;border-left:1pt solid #000;border-right:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTItMS0xLTEyNDMwNA_021d2777-2ab0-4d2a-80ba-71922a3b0c64">The Nasdaq Stock Market LLC</ix:nonNumeric></span></td></tr></table></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;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:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">Emerging growth company   <ix:nonNumeric contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520" name="dei:EntityEmergingGrowthCompany" format="ixt-sec:boolballotbox" id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI0_aad7c988-a4cf-4cc5-958e-1c9b75a63565">&#9744;</ix:nonNumeric></span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;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.&#160;  &#9744;</span></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="ib0bace4228984774acf68b5e7da55def_7"></div><hr style="page-break-after:always"/><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="-sec-extract:summary;margin-bottom:9pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Item 2.03   Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">As previously reported in a Form 8-K filed by Otter Tail Corporation on June 14, 2021 (the &#8220;June 2021 8-K&#8221;), Otter Tail Power Company ("OTP&#8221;), a wholly owned subsidiary of Otter Tail Corporation, entered into a Note Purchase Agreement (the &#8220;Note Purchase Agreement&#8221;) on June 10, 2021, with the purchasers named therein (the &#8220;Purchasers&#8221;), pursuant to which OTP agreed to issue to the Purchasers, in a private placement transaction, $230 million aggregate principal amount of senior unsecured notes consisting of (a) $40 million in aggregate principal amount of its 2.74% Series 2021A Senior Unsecured Notes due November 29, 2031 (the &#8220;Series 2021A Notes&#8221;), (b) $100 million in aggregate principal amount of its 3.69% Series 2021B Senior Unsecured Notes due November 29, 2051 (the &#8220;Series 2021B Notes&#8221;) and (c) $90 million in aggregate principal amount of its 3.77% Series 2022A Senior Unsecured Notes due May 20, 2052 (the  &#8220;Series 2022A Notes&#8221;;  and together with the Series 2021A Notes and the Series 2021B Notes, the &#8220;Notes&#8221;).</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">On May 20, 2022, OTP issued the Series 2022A Notes pursuant to the Note Purchase Agreement for aggregate proceeds of $90 million. OTP will use the proceeds from the issuance to refinance existing indebtedness, fund capital expenditures, and for other general corporate purposes. The Series 2021A Notes and Series 2021B Notes were previously issued on November 29, 2021.</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">As reported in the June 2021 8-K, the Note Purchase Agreement allows OTP to prepay all or part of the Notes (in an amount not less than 10% of the aggregate principal amount then outstanding) at 100% of the principal amount so prepaid, together with unpaid accrued interest and a make-whole amount. If no default or event of default exists under the Note Purchase Agreement, any prepayment made by OTP of all of the (a) Series 2021A Notes then outstanding on or after May 29, 2031, (b) Series 2021B Notes then outstanding on or after May 29, 2051, or (c) Series 2022A Notes then outstanding on or after November 20, 2051 will be made without any make-whole amount. The Note Purchase Agreement also requires OTP to offer to prepay all outstanding Notes at 100% of the principal amount together with unpaid accrued interest in the event of a Change of Control (as defined in the Note Purchase Agreement). </span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">As reported in the June 2021 8-K, the Note Purchase Agreement contains a number of restrictions on the business of OTP that were effective on execution of the Note Purchase Agreement. These include restrictions on OTP&#8217;s abilities to merge, sell substantially all of its assets, create or incur liens on its assets, guarantee the obligations of any other party, and engage in transactions with affiliates. The Note Purchase Agreement also contains other negative covenants and events of default, as well as certain financial covenants. Specifically, OTP may not permit its Interest-bearing Debt (as defined in the Note Purchase Agreement) to exceed 60% of Total Capitalization (as defined in the Note Purchase Agreement), determined as of the end of each fiscal quarter. OTP is also restricted from allowing its Priority Indebtedness (as defined in the Note Purchase Agreement) to exceed 20% of Total Capitalization, determined as of the end of each fiscal quarter. </span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">The summary in this Item 2.03 of the material terms of the Note Purchase Agreement is qualified in its entirety by reference to the full text of the Note Purchase Agreement, a copy of which was filed as Exhibit 4.1 to the June 2021 8-K and is incorporated herein by reference.</span><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%"> </span></div><div style="margin-bottom:6pt;text-indent:36pt"><span><br/></span></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="ib0bace4228984774acf68b5e7da55def_10"></div><hr style="page-break-after:always"/><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="margin-top:18pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%">SIGNATURE</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">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="margin-top:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:95.000%"><tr><td style="width:1.0%"></td><td style="width:49.630%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:3.285%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:43.785%"></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:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">OTTER TAIL CORPORATION</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:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Date: May 23, 2022</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">By:</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">/s/&#160;Kevin G. Moug</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Kevin G. Moug</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:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Chief Financial Officer</span></td></tr></table></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div></body></html>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>2
<FILENAME>ottr-20220520.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:0825e866-3336-45e4-a661-1966e57f8a81,g:bcd2867e-9e84-47f9-a09d-846b9821b0cd-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ottr="http://www.ottertail.com/20220520" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.ottertail.com/20220520">
  <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/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.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="ottr-20220520_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="ottr-20220520_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.ottertail.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.LAB
<SEQUENCE>3
<FILENAME>ottr-20220520_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 2022 Workiva-->
<!--r:0825e866-3336-45e4-a661-1966e57f8a81,g:bcd2867e-9e84-47f9-a09d-846b9821b0cd-->
<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_EntityAddressAddressLine1_011f4873-143d-45d7-94e1-81cd63be055e_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/2021q4/dei-2021q4.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_PreCommencementIssuerTenderOffer_63d51f03-1b81-4b0d-bae7-72fde73a8549_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/2021q4/dei-2021q4.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_EntityAddressPostalZipCode_9fc86db0-1ea8-40ed-8f58-c4d6277e9728_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/2021q4/dei-2021q4.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_EntityRegistrantName_e1d3bb93-7a28-4bab-8238-2e5047f8bc0c_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/2021q4/dei-2021q4.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_WrittenCommunications_fd299134-fbd1-465a-b076-7ab802d55f30_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/2021q4/dei-2021q4.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_LocalPhoneNumber_574362ac-04bd-40e0-a423-8e0f8556fc60_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/2021q4/dei-2021q4.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_SolicitingMaterial_3567ad69-69e8-401c-b60c-2a7f62968706_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/2021q4/dei-2021q4.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_EntityAddressStateOrProvince_66cc79c6-2e1e-43a3-9bf1-e49f59489cb4_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/2021q4/dei-2021q4.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_CityAreaCode_aceb2eaf-ccbb-4a20-81a7-4fc623d01cf3_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/2021q4/dei-2021q4.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_DocumentType_0a645b19-fff2-421c-8987-efbc049ce5b7_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/2021q4/dei-2021q4.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_DocumentPeriodEndDate_107206bf-90d9-4f3a-9707-27f9751f8979_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/2021q4/dei-2021q4.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_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/2021q4/dei-2021q4.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_EntityAddressCityOrTown_5973e973-959e-4ce2-869a-d78968888e76_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/2021q4/dei-2021q4.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_EntityFileNumber_d5fbee32-1f21-473a-925f-9fc90a324a72_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/2021q4/dei-2021q4.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_PreCommencementTenderOffer_6175a71f-c011-47b2-b85a-e9ae784d1610_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/2021q4/dei-2021q4.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_EntityCentralIndexKey_ff9bd9ce-1e50-428d-9f9b-156a9064eac7_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/2021q4/dei-2021q4.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_AmendmentFlag_4b4204f3-a1b3-471a-9092-b4a020585de9_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/2021q4/dei-2021q4.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_TradingSymbol_93f3f355-0c3c-4147-9625-aedfc1aa9850_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/2021q4/dei-2021q4.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_EntityTaxIdentificationNumber_94ae72ed-1e6c-49e9-9b53-886da2799fed_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/2021q4/dei-2021q4.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_EntityEmergingGrowthCompany_002d3cff-c108-430c-9d78-c73766f86c98_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/2021q4/dei-2021q4.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_SecurityExchangeName_b83c738c-73d3-471d-8d3c-3cf9edf05031_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/2021q4/dei-2021q4.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_Security12bTitle_63bddd9c-8fd7-4250-af2c-18c99172ee81_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/2021q4/dei-2021q4.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_EntityIncorporationStateCountryCode_2ee8f0bb-077b-498d-a356-230e32a2595b_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/2021q4/dei-2021q4.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:labelLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>4
<FILENAME>ottr-20220520_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 2022 Workiva-->
<!--r:0825e866-3336-45e4-a661-1966e57f8a81,g:bcd2867e-9e84-47f9-a09d-846b9821b0cd-->
<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.ottertail.com/role/Cover" xlink:type="simple" xlink:href="ottr-20220520.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.ottertail.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_83d40b6f-3178-49d9-b6b7-4029db6a56f9" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_DocumentType_83d40b6f-3178-49d9-b6b7-4029db6a56f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_a3567f49-8676-4fc4-a759-0cb5f00c2ba9" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_DocumentPeriodEndDate_a3567f49-8676-4fc4-a759-0cb5f00c2ba9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_e3763583-2c58-4833-a023-b9ebcde8119d" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityRegistrantName_e3763583-2c58-4833-a023-b9ebcde8119d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_55bdb250-710e-4bbf-b65f-cc377d7d61fd" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityTaxIdentificationNumber_55bdb250-710e-4bbf-b65f-cc377d7d61fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_361f705c-40b7-46c2-8c0e-8166ed4539e8" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityAddressAddressLine1_361f705c-40b7-46c2-8c0e-8166ed4539e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_49b029d6-0116-4146-b914-67b6c7a7b77a" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityAddressCityOrTown_49b029d6-0116-4146-b914-67b6c7a7b77a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_f8e75ae3-6ae6-41bc-9ad5-4314975bebf3" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityAddressStateOrProvince_f8e75ae3-6ae6-41bc-9ad5-4314975bebf3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_10cf3c54-5146-411a-af23-22f146503a38" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityAddressPostalZipCode_10cf3c54-5146-411a-af23-22f146503a38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_357cf761-eef1-46dd-9589-4b33420157bf" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_CityAreaCode_357cf761-eef1-46dd-9589-4b33420157bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_fe6298ef-fe2e-47b6-883a-67e005fd9cb0" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_LocalPhoneNumber_fe6298ef-fe2e-47b6-883a-67e005fd9cb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_7f227c92-031c-445d-bbad-875df2a6c917" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_Security12bTitle_7f227c92-031c-445d-bbad-875df2a6c917" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_1f212ce5-553a-4315-89f3-0406f425fa3a" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_TradingSymbol_1f212ce5-553a-4315-89f3-0406f425fa3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_8b4ff605-f494-40b7-9ddd-9ac63024e3ab" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_SecurityExchangeName_8b4ff605-f494-40b7-9ddd-9ac63024e3ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_b32f1df6-a690-4762-8191-c0cd9bbf97ab" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityEmergingGrowthCompany_b32f1df6-a690-4762-8191-c0cd9bbf97ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_bf4b585f-513c-4592-ab63-f4146380d999" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityCentralIndexKey_bf4b585f-513c-4592-ab63-f4146380d999" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_30465f40-a350-4fa0-b808-2bc97c03e9eb" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_AmendmentFlag_30465f40-a350-4fa0-b808-2bc97c03e9eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_44537e37-d97f-41de-871b-9ea94b7639c4" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_WrittenCommunications_44537e37-d97f-41de-871b-9ea94b7639c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_e30b9309-38a1-449e-912a-4fd9a2eaae6c" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_SolicitingMaterial_e30b9309-38a1-449e-912a-4fd9a2eaae6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_e159a328-7a13-430c-b130-aba58dbc48b2" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_PreCommencementTenderOffer_e159a328-7a13-430c-b130-aba58dbc48b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_1a5c5d36-3aaf-4e57-8c44-5c73cf0d1e1a" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_1a5c5d36-3aaf-4e57-8c44-5c73cf0d1e1a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_b7c63500-91ec-44b7-acd8-b17544eca0c0" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityFileNumber_b7c63500-91ec-44b7-acd8-b17544eca0c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_3e596a60-ebc1-42fe-b403-097bde629484" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c50aaedb-ba2c-43bd-b64c-b9d164e25891" xlink:to="loc_dei_EntityIncorporationStateCountryCode_3e596a60-ebc1-42fe-b403-097bde629484" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>5
<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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140106650928680">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>May 20, 2022</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_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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 custom" 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">May 20,  2022<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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">OTTER TAIL CORPORATION<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">27-0383995<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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">215 South Cascade Street,&#160;P.O. Box 496<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">Fergus Falls<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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">MN<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">56538-0496<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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">866<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">410-8780<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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 Shares, par value $5.00 per share<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">OTTR<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" 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">NASDAQ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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="ro">
<td class="pl custom" 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">0001466593<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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>
<tr class="ro">
<td class="pl custom" 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="re">
<td class="pl custom" 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="ro">
<td class="pl custom" 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="re">
<td class="pl custom" 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="ro">
<td class="pl custom" 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">0-53713<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" 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">MN<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_CoverAbstract">
<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>Cover page.</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_CoverAbstract</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_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>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  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_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 Exchange Act<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 Exchange Act<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_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 Exchange Act<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 Exchange Act<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>XML
<SEQUENCE>6
<FILENAME>ottr-20220520_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/2021q4"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ottr-20220520.xsd" xlink:type="simple"/>
    <context id="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001466593</identifier>
        </entity>
        <period>
            <startDate>2022-05-20</startDate>
            <endDate>2022-05-20</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl80L2ZyYWc6YzQ2YTkwOTQ3ZDI2NGEzYWIzZDMwMDhlMGY0YTdhM2EvdGFibGU6ODkxYzNlYTU3MzA1NDVmNGE5NjVmY2E3ODIwY2ZiNTIvdGFibGVyYW5nZTo4OTFjM2VhNTczMDU0NWY0YTk2NWZjYTc4MjBjZmI1Ml8yLTEtMS0xLTEyNDMwNA_ee16ff18-1105-460e-a5ec-d4829ccb7b23">0001466593</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl80L2ZyYWc6YzQ2YTkwOTQ3ZDI2NGEzYWIzZDMwMDhlMGY0YTdhM2EvdGFibGU6ODkxYzNlYTU3MzA1NDVmNGE5NjVmY2E3ODIwY2ZiNTIvdGFibGVyYW5nZTo4OTFjM2VhNTczMDU0NWY0YTk2NWZjYTc4MjBjZmI1Ml8zLTEtMS0xLTEyNDMwNA_b2b46581-938f-42e1-91bb-ea6ba464892c">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI2_1d148ba1-eeb1-44ed-8292-2629e89fb1fa">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzA3_cc2bb569-fe52-4a62-8e0f-b8da260868ad">2022-05-20</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI1_f4f8d889-26e2-4ca9-a3fa-701e8e3bd605">OTTER TAIL CORPORATION</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTAtMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjAzYTcyZGJhODE1MDQ3YmE5NTJlMzgyZDMyMGY1YTdiXzQ_9f7404cc-f4cb-4290-a203-356250bfec71">MN</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTEtMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjhjYWM0NjgzNjFlMjQxMmI5ZWIwOTBkNjk5MmI4NGEzXzQ_5aedf8c7-1473-470a-ac57-efcb1559e9a4">0-53713</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6NWQxMDA3YmE2MGFmNDQwYTlmNDNjMzQ2M2NiMzUyMzQvdGFibGVyYW5nZTo1ZDEwMDdiYTYwYWY0NDBhOWY0M2MzNDYzY2IzNTIzNF8wLTItMS0xLTEyNDMwNC90ZXh0cmVnaW9uOjA0MzVmZDczMjI1MzQzMzJiNTZmM2ZlZDNhNTk3MWNmXzQ_b8be0585-269f-42a4-a51d-437eae8d923c">27-0383995</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE1_1001019e-c413-49c7-b300-8ef2d719cd92">215 South Cascade Street,&#160;P.O. Box 496</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEx_7f5a19f7-6803-4b35-9a63-8556ddd27b6e">Fergus Falls</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIw_6b8a473b-0e63-4648-8d4a-6e916331c0dc">MN</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIx_92155d02-4e5f-4451-b537-74f5efb98ecb">56538-0496</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml80NTA_96b44ac7-4cf9-47c7-98f2-63e2cc4181db">866</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEy_9586feca-d2a8-4068-b3c8-f3a6e7d5473d">410-8780</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE0_6dd0a3a9-e923-45cf-98de-5f9f19b5a08f">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzIy_2b63f0ad-a501-4ee8-8660-486576521f76">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzE3_956ab1bd-5ed3-4a54-8121-25687372dc9c">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzEz_5540df87-03b5-4bc4-9f0a-82601d2382b1">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTAtMS0xLTEyNDMwNA_66b09aec-83d2-4bc0-8bde-55149c0ed71d">Common Shares, par value $5.00 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTEtMS0xLTEyNDMwNA_4c6f1c8b-6d6d-4fc0-8934-f200ec45a8d8">OTTR</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGFibGU6YzJmNjY4OTYyMjNhNDVkZjgwNGZlNzM2NTBhZjdmYTQvdGFibGVyYW5nZTpjMmY2Njg5NjIyM2E0NWRmODA0ZmU3MzY1MGFmN2ZhNF8xLTItMS0xLTEyNDMwNA_021d2777-2ab0-4d2a-80ba-71922a3b0c64">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520"
      id="id3VybDovL2RvY3MudjEvZG9jOmIwYmFjZTQyMjg5ODQ3NzRhY2Y2OGI1ZTdkYTU1ZGVmL3NlYzpiMGJhY2U0MjI4OTg0Nzc0YWNmNjhiNWU3ZGE1NWRlZl8xL2ZyYWc6NzJiZmJjYzM1NTE0NDUxM2IxODcyNzBlNGE3ODYzNzIvdGV4dHJlZ2lvbjo3MmJmYmNjMzU1MTQ0NTEzYjE4NzI3MGU0YTc4NjM3Ml8xNzI0_aad7c988-a4cf-4cc5-958e-1c9b75a63565">false</dei:EntityEmergingGrowthCompany>
</xbrl>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>7
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 Financial_Report.xlsx
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M=]W3CHG&K=!X#;[Q3X?#KHG&J]!TZVDF)_VN:Z3I%FA"1N/K>A(5M>5 TR
M6'!VULS2 Y9>*?IUE!K9';O=05SP6.XYB1'^QL4$UFG2&98T1G*=D 4. #?$
MT4Q0?*]!MHK@PI+27)#6SRFU4!H(FLB!]4>"(<7<K_WUE[O)I#-ZG7TZSFN4
M?VFK :?MNYO/D_QSZ.2?IY/734+.<+PL"?'[(UMAAR=N.Q-R.AQG0GS/]O:1
MI24RS^_Y"NM./&<?5I:P7<_/Y)Z,<B.[W?98??9/1VXCUZG LR+7E$8D19_(
M+;KD$3BU20TR$S\(G8:8:E < J0),9:AAOBTQJP1X!-]M[X(R-^-B/>K;YH]
M5Z%82=J$^!!&&N*<<^9ST6S[!Z5&T?95O-RCEU@5 9<8WS2J-2S%UGB5P/&M
MG#P=$Q+-E L&08:7)"82J3E^34@3_BNEVOZ<TT#PE"\D^DJ1CVFS(Z=T)LWH
M,QK!1J\;=8=HTCQZ_@7YG#4*')$;'0)G&[-&(81IN_ >KR2.FJW"$2M"/F(9
M-AIRM1:!MG&IA&!:$L;1>$[2M!'\6:PUDSY@R.S-D77.UI$.$9)>-T(^8LZ+
MD!&_'H8X2IKMHG%8!/V>7L-)P>B"RV;]N'Z&U3-L+([W1]072N0/)J<_Z3(T
M!Z.:60F]A%9JGZJ'-#ZH'C(*!?&Y'C[E>G@*-Y;&O%"N@GL!_]':-\*K^(+
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MU4#E/]O4#6CV#30<D05>,9FV-J/D3@H\W/[O#;#"Q([A[8N_ 5!+ P04
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MF;(OP/.5E.;4L(?0_#>$P7]02P,$%     @ )%ZW5)^@&_"Q @  X@P   T
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M':5_'<?VD-/IKV,BM'I;Z/EQ:%0*CMQC)8QQ8K3^-8+)#^Q^ %!+ P04
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M;64O=&AE;64Q+GAM;%!+ 0(4 Q0    ( "1>MU1'\<;K2 0  $\0   8
M          " @0X(  !X;"]W;W)K<VAE971S+W-H965T,2YX;6Q02P$"% ,4
M    "  D7K=4GZ ;\+$"  #B#   #0              @ &,#   >&PO<W1Y
M;&5S+GAM;%!+ 0(4 Q0    ( "1>MU27BKL<P    !,"   +
M  "  6@/  !?<F5L<R\N<F5L<U!+ 0(4 Q0    ( "1>MU2JQ"(6,P$  "("
M   /              "  5$0  !X;"]W;W)K8F]O:RYX;6Q02P$"% ,4
M"  D7K=4)!Z;HJT   #X 0  &@              @ &Q$0  >&PO7W)E;',O
M=V]R:V)O;VLN>&UL+G)E;'-02P$"% ,4    "  D7K=499!YDAD!  #/ P
M$P              @ &6$@  6T-O;G1E;G1?5'EP97-=+GAM;%!+!08
.."0 ) #X"  #@$P     !

end
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<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>9
<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>10
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1</ContextCount>
  <ElementCount>22</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>0</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>0</UnitCount>
  <MyReports>
    <Report instance="ottr-20220520.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ottertail.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="ottr-20220520.htm">ottr-20220520.htm</File>
    <File>ottr-20220520.xsd</File>
    <File>ottr-20220520_lab.xml</File>
    <File>ottr-20220520_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="22">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>12
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
{
 "instance": {
  "ottr-20220520.htm": {
   "axisCustom": 0,
   "axisStandard": 0,
   "contextCount": 1,
   "dts": {
    "inline": {
     "local": [
      "ottr-20220520.htm"
     ]
    },
    "labelLink": {
     "local": [
      "ottr-20220520_lab.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "ottr-20220520_pre.xml"
     ]
    },
    "schema": {
     "local": [
      "ottr-20220520.xsd"
     ],
     "remote": [
      "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",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd",
      "https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd"
     ]
    }
   },
   "elementCount": 23,
   "entityCount": 1,
   "hidden": {
    "http://xbrl.sec.gov/dei/2021q4": 2,
    "total": 2
   },
   "keyCustom": 0,
   "keyStandard": 22,
   "memberCustom": 0,
   "memberStandard": 0,
   "nsprefix": "ottr",
   "nsuri": "http://www.ottertail.com/20220520",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ottr-20220520.htm",
      "contextRef": "i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520",
      "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.ottertail.com/role/Cover",
     "shortName": "Cover",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ottr-20220520.htm",
      "contextRef": "i79b80d5f55014a7bbbbe571b9735c334_D20220520-20220520",
      "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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r1"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r1"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r1"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r1"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "employerIdItemType"
    },
    "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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_PreCommencementIssuerTenderOffer": {
     "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 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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_PreCommencementTenderOffer": {
     "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 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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r2"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.com/role/Cover"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_SolicitingMaterial": {
     "auth_ref": [
      "r5"
     ],
     "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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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/2021q4",
     "presentation": [
      "http://www.ottertail.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": "b-2"
  },
  "r2": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r3": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13e",
   "Subsection": "4c"
  },
  "r4": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14d",
   "Subsection": "2b"
  },
  "r5": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14a",
   "Subsection": "12"
  },
  "r6": {
   "Name": "Securities Act",
   "Number": "230",
   "Publisher": "SEC",
   "Section": "425"
  }
 },
 "version": "2.1"
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>13
<FILENAME>0001466593-22-000035-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 0001466593-22-000035-xbrl.zip
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M9>DY9!F?[$LU6=[M?O;6L57OGI\VG_H88#=%<W(K@,T=R'%A_W8X5MN_[TC
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M]>0>\@$Q)U7>5L?S]F&]2^N%0_7Z[?+&Z]5]OUA!*^AV>SEY!E!+ P04
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MK*1I8R,#(E444![Z@)!(,AQ3JI7LUL:VS#0V,)=-FU'KU>4Z;C^U&6S;WA[
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MOV/GYM'IB]4SR>+7=)^^^!]02P,$%     @ )%ZW5(AGS<VJ!@  .C$  !4
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MOV%Z$ =\^AR\7<\= _&^;//V_A-<YIT29?NK6\$2A-%"98+PH!#H3 C<'KE
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M   1              "  0    !O='1R+3(P,C(P-3(P+FAT;5!+ 0(4 Q0
M   ( "1>MU1-7PCZ;@(  '<'   1              "  5$6  !O='1R+3(P
M,C(P-3(P+GAS9%!+ 0(4 Q0    ( "1>MU1,72]B10H  '1=   5
M      "  >X8  !O='1R+3(P,C(P-3(P7VQA8BYX;6Q02P$"% ,4    "  D
M7K=4B&?-S:H&   Z,0  %0              @ %F(P  ;W1T<BTR,#(R,#4R
?,%]P<F4N>&UL4$L%!@     $  0 ! $  $,J      $!

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