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Condensed Statements of Cash Flows (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 510,064 $ 495,777 $ 768,374
Investments (6,477) (3,973) (1,814)
Net cash used in investing activities (638,881) (885,878) (630,243)
Proceeds from issuance of common stock (149) 88,767 3,385
Dividends paid (176,915) (171,354) (166,405)
Repurchase of common stock (7,399) (6,701) 0
Tax withholding on stock-based compensation (4,904) (4,127) (362)
Net cash used in financing activities 155,173 384,715 (145,043)
Increase (decrease) in cash and cash equivalents 26,356 (5,386) (6,912)
Cash and cash equivalents - beginning of year 54,161 59,547 66,459
Cash and cash equivalents - end of year 80,517 54,161 59,547
MDU Resources Group, Inc. [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 242,199 187,297 226,642
Investments in and advances to subsidiaries (45,000) (102,000) (67,000)
Investments (885) (391) (4)
Net cash used in investing activities (45,885) (102,391) (67,004)
Proceeds from issuance of common stock (149) 88,767 3,385
Dividends paid (176,915) (171,354) (166,405)
Repurchase of common stock (3,525) (2,992) 0
Tax withholding on stock-based compensation (2,398) (1,949) (163)
Net cash used in financing activities (182,987) (87,528) (163,183)
Increase (decrease) in cash and cash equivalents 13,327 (2,622) (3,545)
Cash and cash equivalents - beginning of year 6,159 8,781 12,326
Cash and cash equivalents - end of year $ 19,486 $ 6,159 $ 8,781