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Condensed Balance Sheets (Details 2) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 59,547 | $ 66,459 | $ 53,948 | $ 34,599
Receivables, net | 873,986 | 836,605 |  |
Prepayments and other current assets | 44,120 | 52,617 |  |
Total current assets | 1,337,347 | 1,297,701 |  |
Noncurrent Assets |  |  |  |
Investments | 165,022 | 148,656 |  |
Operating lease right-of-use assets | 120,113 | 115,323 |  |
Other | 144,111 | 153,849 |  |
Total noncurrent assets | 6,716,025 | 6,385,358 |  |
Total assets | 8,053,372 | 7,683,059 | 6,988,110 |
Current liabilities: |  |  |  |
Accounts payable | 426,264 | 403,391 |  |
Taxes payable | 88,844 | 48,970 |  |
Dividends payable | 42,611 | 41,580 |  |
Accrued compensation | 90,629 | 99,269 |  |
Operating lease liabilities due within one year | 33,655 | 31,664 |  |
Other accrued liabilities | 198,514 | 182,078 |  |
Total current liabilities | 963,522 | 866,427 |  |
Noncurrent liabilities: |  |  |  |
Operating lease liabilities | 86,868 | 83,742 |  |
Other | 327,773 | 291,826 |  |
Total noncurrent liabilities | 4,010,745 | 3,969,386 |  |
Commitments and contingencies |  |  |  |
Commitments and Contingencies |  |  |  |
Stockholders' equity: |  |  |  |
Common stock | 201,061 | 200,923 |  |
Other paid-in capital | 1,371,385 | 1,355,404 |  |
Retained earnings | 1,558,363 | 1,336,647 |  |
Accumulated other comprehensive loss | (48,078) | (42,102) |  |
Treasury stock at cost - 538,921 shares | (3,626) | (3,626) |  |
Stockholders' Equity Attributable to Parent | 3,079,105 | 2,847,246 |  |
Total liabilities and stockholders' equity | $ 8,053,372 | $ 7,683,059 |  |
Common Stock, Shares Authorized | 500,000,000 | 500,000,000 |  |
Common Stock, Par or Stated Value Per Share | $ 1.00 | $ 1.00 |  |
Common Stock, Shares, Issued | 201,061,198 | 200,922,790 |  |
Treasury Stock, Common, Shares | 538,921 | 538,921 |  |
MDU Resources Group, Inc. [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | $ 8,781 | $ 12,326 | $ 2,271 | $ 843
Receivables, net | 4,865 | 4,727 |  |
Accounts receivable from subsidiaries | 50,539 | 49,943 |  |
Prepayments and other current assets | 1,612 | 501 |  |
Total current assets | 65,797 | 67,497 |  |
Noncurrent Assets |  |  |  |
Investments | 52,000 | 46,294 |  |
Investment in subsidiaries | 3,069,956 | 2,842,068 |  |
Deferred income taxes | 9,691 | 7,269 |  |
Operating lease right-of-use assets | 56 | 153 |  |
Other | 28,866 | 27,098 |  |
Total noncurrent assets | 3,160,569 | 2,922,882 |  |
Total assets | 3,226,366 | 2,990,379 |  |
Current liabilities: |  |  |  |
Accounts payable | 2,135 | 2,981 |  |
Accounts payable to subsidiaries | 5,412 | 4,752 |  |
Taxes payable | 4,056 | 1,253 |  |
Dividends payable | 42,611 | 41,580 |  |
Accrued compensation | 7,825 | 8,812 |  |
Operating lease liabilities due within one year | 40 | 96 |  |
Other accrued liabilities | 6,881 | 7,690 |  |
Total current liabilities | 68,960 | 67,164 |  |
Noncurrent liabilities: |  |  |  |
Operating lease liabilities | 16 | 56 |  |
Other | 78,285 | 75,913 |  |
Total noncurrent liabilities | 78,301 | 75,969 |  |
Commitments and contingencies |  |  |  |
Commitments and Contingencies |  |  |  |
Stockholders' equity: |  |  |  |
Common stock | 201,061 | 200,923 |  |
Other paid-in capital | 1,371,385 | 1,355,404 |  |
Retained earnings | 1,558,363 | 1,336,647 |  |
Accumulated other comprehensive loss | (48,078) | (42,102) |  |
Treasury stock at cost - 538,921 shares | (3,626) | (3,626) |  |
Stockholders' Equity Attributable to Parent | 3,079,105 | 2,847,246 |  |
Total liabilities and stockholders' equity | $ 3,226,366 | $ 2,990,379 |  |
Common Stock, Shares Authorized | 500,000,000 | 500,000,000 |  |
Common Stock, Par or Stated Value Per Share | $ 1.00 | $ 1.00 |  |
Common Stock, Shares, Issued | 201,061,198 | 200,922,790 |  |
Treasury Stock, Common, Shares | 538,921 | 538,921 |  |

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