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Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000067716-21-000007
Filing Date
2021-02-19
Accepted
2021-02-19 09:01:54
Documents
173
Period of Report
2020-12-31

Document Format Files

Seq Description Document Type Size
1 10-K mdu-20201231.htm   iXBRL 10-K 5721982
2 MDU RESOURCES WBI AMENDED AND RESTATED NOTE PURCHASE AGREEMENT 09-12-2013 a2020ex4h.htm EX-4.H 379641
3 MDU RESOURCES WBI FIRST AMENDED AND RESTATED NOTE PURCHASE AGREEMENT 05-17-2016 a2020ex4i.htm EX-4.I 59410
4 MDU RESOURCES WBI SECOND AMENDED AND RESTATED NOTE PURCHASE AGREEMENT 07-26-2019 a2020ex4j.htm EX-4.J 54618
5 MDU RESOURCES EXECUTIVE INCENTIVE COMPENSATION PLAN AMENDED 11-12-2020 a2020ex10h.htm EX-10.H 23967
6 MDU RESOURCES LONG-TERM PERFORMANCE INCENTIVE PLAN a2020ex10l.htm EX-10.L 68689
7 MDU RESOURCES RESTRICTIVE STOCK UNIT AWARD AGREEMENT a2020ex10n.htm EX-10.N 35820
8 MDU RESOURCES SECTION 16 OFFICERS AND DIRECTORS a2020ex10q.htm EX-10.Q 24049
9 MDU RESOURCES NONQUALIFIED DEFINED CONTRIBUTION PLAN 11-12-20 a2020ex10r.htm EX-10.R 76800
10 MDU RESOURCES 401 K RETIREMENT PLAN AMENDMENT 12-17-20 a2020ex10u.htm EX-10.U 6543
11 MDU RESOURCES SUBSIDIARIES OF MDU RESOURCES a2020ex21.htm EX-21 49401
12 MDU RESOURCES CONSENT OF INDEPENDENT ACCOUNTING FIRM a2020ex23.htm EX-23 2270
13 MDU RESOURCES CERTIFICATION OF CHIEF EXECUTIVE OFFICER a2020ex31a.htm EX-31.A 8635
14 MDU RESOURCES CERTIFICATION OF CHIEF FINANCIAL OFFICER a2020ex31b.htm EX-31.B 8614
15 MDU RESOURCES CERTIFICATION OF CEO AND CFO a2020ex32.htm EX-32 5798
16 MDU RESOURCES MINE SAFETY DISCLOSURES a2020ex95.htm EX-95 232002
  Complete submission text file 0000067716-21-000007.txt   25584377

Data Files

Seq Description Document Type Size
17 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT mdu-20201231.xsd EX-101.SCH 114172
18 XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT mdu-20201231_cal.xml EX-101.CAL 152463
19 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT mdu-20201231_def.xml EX-101.DEF 971230
20 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT mdu-20201231_lab.xml EX-101.LAB 1417712
21 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT mdu-20201231_pre.xml EX-101.PRE 1149041
22 EXTRACTED XBRL INSTANCE DOCUMENT mdu-20201231_htm.xml XML 5449250
Mailing Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503
Business Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503 701-530-1000
MDU RESOURCES GROUP INC (Filer) CIK: 0000067716 (see all company filings)

IRS No.: 301133956 | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-03480 | Film No.: 21652183
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)