# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000067716-12-000031
Filing Date
2012-02-24
Accepted
2012-02-24 10:12:39
Documents
24
Period of Report
2011-12-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | MDU RESOURCES GROUP, INC. 2011 FORM 10-K | mdu123111-10k.htm | 10-K | 4746519
2 | COMPANY BYLAWS | mdu123111-ex3b.htm | EX-3.B | 164382
3 | MDUR CREDIT AGREEMENT, DATED 05/26/2011 | mdu123111-ex4e.htm | EX-4.E | 680330
4 | LONG-TERM PERFORMANCE-BASED INCENTIVE PLAN, AS AMENDED 11/17/2011 | mdu123111-ex10h.htm | EX-10.H | 100181
5 | MDUR SECTION 16 OFFICERS AND DIRECTORS WITH INDEMNIFICATION CHART, AS OF 12/31/2 | mdu123111-ex10u.htm | EX-10.U | 29027
6 | EMPLOYMENT LETTER FOR J KENT WELLS, DATED 03/09/2011 | mdu123111-ex10v.htm | EX-10.V | 85572
7 | MDUR LONG-TERM PERFORMANCE-BASED INCENTIVE PLAN 2011 FIDELITY PRESIDENT AND CEO | mdu123111-ex10w.htm | EX-10.W | 27639
8 | MDUR NONQUALIFIED DEFINED CONTRIBUTION PLAN, AS ADOPTED 11/17/2011 | mdu123111-ex10x.htm | EX-10.X | 73190
9 | INSTRUMENT OF AMENDMENT TO THE MDUR 401(K) RETIREMENT PLAN, DATED 12/29/2011 | mdu123111-ex10ac.htm | EX-10.AC | 41087
10 | COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES & COMBINED FIXED CHARGES & PRE | mdu123111-ex12.htm | EX-12 | 101109
11 | SUBSIDIARIES OF MDU RESOURCES GROUP, INC. | mdu123111-ex21.htm | EX-21 | 46773
12 | CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM | mdu123111-ex23a.htm | EX-23.A | 3737
13 | CONSENT OF RYDER SCOTT COMPANY, L.P. | mdu123111-ex23b.htm | EX-23.B | 11161
14 | CERTIFICATION OF CEO - SEC 302 SOX ACT 2002 | mdu123111-ex31a.htm | EX-31.A | 11054
15 | CERTIFICATION OF CFO - SEC 302 SOX ACT 2002 | mdu123111-ex31b.htm | EX-31.B | 11027
16 | CERTIFICATION OF CEO AND CFO - 18 USC SEC 1350 - SEC 906 SOX ACT 2002 | mdu123111-ex32.htm | EX-32 | 7453
17 | MINE SAFETY DISCLOSURES | mdu123111-ex95.htm | EX-95 | 271503
18 | RYDER SCOTT COMPANY, L.P. REPORT | mdu123111-ex99.htm | EX-99 | 163292
| Complete submission text file | 0000067716-12-000031.txt |  | 34020192

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
19 | XBRL INSTANCE DOCUMENT | mdu-20111231.xml | EX-101.INS | 6433578
20 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | mdu-20111231.xsd | EX-101.SCH | 126085
21 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | mdu-20111231_cal.xml | EX-101.CAL | 171812
22 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | mdu-20111231_def.xml | EX-101.DEF | 781093
23 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | mdu-20111231_lab.xml | EX-101.LAB | 1764666
24 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | mdu-20111231_pre.xml | EX-101.PRE | 977033

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.: 12636108
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)