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Condensed Statements of Cash Flows (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating activities: | $ 542,280 | $ 499,881 | $ 448,011
Capital expenditures | (576,065) | (568,230) | (341,382)
Net proceeds from sale or disposition of property and other | 29,812 | 26,100 | 126,588
Investments | (2,011) | (2,321) | (1,608)
Net cash used in investing activities | (603,861) | (710,907) | (214,168)
Issuance of long-term debt | 599,455 | 566,829 | 140,812
Repayment of long-term debt | (468,917) | (174,520) | (217,394)
Payments of stock issuance costs | 0 | (10) | 0
Proceeds from issuance of common stock | 106,848 | 0 | 0
Dividends paid | (160,256) | (154,573) | (150,727)
Redemption of preferred stock | 0 | 0 | (15,600)
Repurchase of common stock | 0 | (5,020) | (1,684)
Tax withholding on stock-based compensation | (3,015) | (2,330) | (757)
Net cash used in financing activities | 74,092 | 230,376 | (245,350)
Increase (decrease) in cash and cash equivalents | 12,511 | 19,349 | (11,508)
Cash and cash equivalents - beginning of year | 53,948 | 34,599 | 46,107
Cash and cash equivalents - end of year | 66,459 | 53,948 | 34,599
MDU Resources Group, Inc. [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating activities: | 168,520 | 294,379 | 284,075
Capital expenditures | 0 | (242,692) | (146,370)
Net proceeds from sale or disposition of property and other | 0 | 5,032 | (5,665)
Investments in and advances to subsidiaries | (120,000) | (40,000) | (40,000)
Advances from subsidiaries | 17,000 | 70,000 | 40,000
Investments | (236) | (528) | (468)
Net cash used in investing activities | (103,236) | (208,188) | (152,503)
Issuance of long-term debt | 0 | 199,422 | 70,080
Repayment of long-term debt | 0 | (125,961) | (37,569)
Payments of stock issuance costs | 0 | (10) | 0
Proceeds from issuance of common stock | 106,848 | 0 | 0
Dividends paid | (160,256) | (154,573) | (150,727)
Redemption of preferred stock |  |  | (15,600)
Repurchase of common stock | 0 | (1,920) | (564)
Tax withholding on stock-based compensation | (1,821) | (1,721) | (508)
Net cash used in financing activities | (55,229) | (84,763) | (134,888)
Increase (decrease) in cash and cash equivalents | 10,055 | 1,428 | (3,316)
Cash and cash equivalents - beginning of year | 2,271 | 843 | 4,159
Cash and cash equivalents - end of year | $ 12,326 | $ 2,271 | $ 843

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