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v3.20.4

Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,385,160 | $ 1,587,289 | $ 1,362,928 | $ 1,197,373 | $ 1,378,213 | $ 1,563,799 | $ 1,303,573 | $ 1,091,191 | $ 5,532,750 | $ 5,336,776 | $ 4,531,552
Operating expenses | 1,239,270 | 1,383,578 | 1,224,674 | 1,140,303 | 1,247,992 | 1,374,329 | 1,206,262 | 1,026,973 | 4,987,825 | 4,855,556 | 4,129,829
Operating income | 145,890 | 203,711 | 138,254 | 57,070 | 130,221 | 189,470 | 97,311 | 64,218 | 544,925 | 481,220 | 401,723
Other income |  |  |  |  |  |  |  |  | 26,711 | 15,812 | (238)
Interest expense |  |  |  |  |  |  |  |  | 96,519 | 98,587 | 84,614
Income before income taxes |  |  |  |  |  |  |  |  | 475,117 | 398,445 | 316,871
Income taxes |  |  |  |  |  |  |  |  | 84,590 | 63,279 | 47,485
Net income from continuing operations | $ 112,131 | $ 153,015 | $ 99,842 | $ 25,539 | $ 94,804 | $ 136,128 | $ 63,145 | $ 41,089 | 390,527 | 335,166 | 269,386
Comprehensive income |  |  |  |  |  |  |  |  | 384,229 | 331,693 | 279,269
MDU Resources Group, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 628,331
Operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 540,125
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 88,206
Other income |  |  |  |  |  |  |  |  | 0 | 0 | 1,504
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 32,761
Income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 56,949
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | (4,259)
Equity in earnings of subsidiaries from continuing operations |  |  |  |  |  |  |  |  | 390,527 | 335,166 | 208,177
Net income from continuing operations |  |  |  |  |  |  |  |  | 390,527 | 335,166 | 269,385
Equity in earnings (loss) of subsidiaries from discontinued operations |  |  |  |  |  |  |  |  | (322) | 287 | 2,933
Net income |  |  |  |  |  |  |  |  | 390,205 | 335,453 | 272,318
Comprehensive income |  |  |  |  |  |  |  |  | $ 384,229 | $ 331,693 | $ 279,269

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