# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000067716-13-000021
Filing Date
2013-02-28
Accepted
2013-02-28 16:42:15
Documents
19
Period of Report
2012-12-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | MDU RESOURCES GROUP, INC. 2012 FORM 10-K | mduform10-k.htm | 10-K | 3960344
2 | DIRECTOR COMPENSATION POLICY 2/14/13 | exhibit10b.htm | EX-10.B | 37540
3 | MDUR SECTION 16 OFFICERS & DIRECTORS W/ INDEMNIFICATION AGREEMENTS CHART 1/4/13 | exhibit10n.htm | EX-10.N | 31740
4 | INSTRUMENT OF AMENDMENT TO MDUR 401(K) RETIREMENT PLAN 12/19/12 | exhibit10z.htm | EX-10.Z | 22998
5 | COMPUTATION OF RATIO OF EARNINGS | exhibit12.htm | EX-12 | 67934
6 | SUBSIDIARIES OF MDU RESOURCES GROUP, INC. | exhibit21.htm | EX-21 | 47347
7 | CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM | exhibit23a.htm | EX-23.A | 3469
8 | CONSENT OF RYDER SCOTT COMPANY, L.P. | exhibit23b.htm | EX-23.B | 11195
9 | CERTIFICATION OF CEO - SEC 302 SOX ACT 2002 | exhibit31a.htm | EX-31.A | 11052
10 | CERTIFICATION OF CFO - SEC 302 SOX ACT 2002 | exhibit31b.htm | EX-31.B | 11035
11 | CERTIFICATION OF CEO AND CFO - 18 USC SEC 1350 - SEC 906 SOX ACT 2002 | exhibit32.htm | EX-32 | 7452
12 | MINE SAFETY DISCLOSURES | exhibit95.htm | EX-95 | 201282
13 | RYDER SCOTT COMPANY, L.P. REPORT DATED 1/30/13 | exhibit99.htm | EX-99 | 155619
| Complete submission text file | 0000067716-13-000021.txt |  | 29610617

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
14 | XBRL INSTANCE DOCUMENT | mdu-20121231.xml | EX-101.INS | 5637510
15 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | mdu-20121231.xsd | EX-101.SCH | 135532
16 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | mdu-20121231_cal.xml | EX-101.CAL | 141668
17 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | mdu-20121231_lab.xml | EX-101.LAB | 1775438
18 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | mdu-20121231_pre.xml | EX-101.PRE | 1113257
19 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | mdu-20121231_def.xml | EX-101.DEF | 938641

Mailing Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503
Business Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503 701-530-1059
MDU RESOURCES GROUP INC (Filer) CIK: 0000067716 (see all company filings)

EIN.: 410423660 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-03480 | Film No.: 13652805
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)