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Condensed Statements of Cash Flows (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 495,777 | $ 768,374 | $ 542,280
Capital expenditures | (659,425) | (558,007) | (576,065)
Net proceeds from sale or disposition of property and other | 15,238 | 35,557 | 29,812
Investments | (3,973) | (1,814) | (2,011)
Net cash used in investing activities | (885,878) | (630,243) | (603,861)
Issuance of long-term debt | 554,027 | 117,450 | 603,969
Repayment of long-term debt | (24,979) | (148,634) | (468,917)
Proceeds from issuance of common stock | 88,767 | 3,385 | 106,848
Dividends paid | (171,354) | (166,405) | (160,256)
Repurchase of common stock | (6,701) | 0 | 0
Tax withholding on stock-based compensation | (4,127) | (362) | (3,015)
Net cash used in financing activities | 384,715 | (145,043) | 74,092
Cash and cash equivalents - beginning of year | 59,547 | 66,459 | 53,948
Cash and cash equivalents - end of year | 54,161 | 59,547 | 66,459
MDU Resources Group, Inc. [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 187,297 | 226,642 | 168,520
Investments in and advances to subsidiaries | (102,000) | (67,000) | (120,000)
Advances from subsidiaries | 0 | 0 | 17,000
Investments | (391) | (4) | (236)
Net cash used in investing activities | (102,391) | (67,004) | (103,236)
Proceeds from issuance of common stock | 88,767 | 3,385 | 106,848
Dividends paid | (171,354) | (166,405) | (160,256)
Repurchase of common stock | (2,992) | 0 | 0
Tax withholding on stock-based compensation | (1,949) | (163) | (1,821)
Net cash used in financing activities | (87,528) | (163,183) | (55,229)
Increase (decrease) in cash and cash equivalents | (2,622) | (3,545) | 10,055
Cash and cash equivalents - beginning of year | 8,781 | 12,326 | 2,271
Cash and cash equivalents - end of year | $ 6,159 | $ 8,781 | $ 12,326

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