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Condensed Balance Sheets (Details 2) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 80,517 | $ 54,161 | $ 59,547 | $ 66,459
Receivables, net | 1,305,642 | 946,741 |  |
Prepayments and other current assets | 72,972 | 95,741 |  |
Assets, Current | 2,011,748 | 1,550,943 |  |
Noncurrent Assets |  |  |  |
Investments | 161,913 | 175,476 |  |
Operating lease right-of-use assets | 119,375 | 124,138 |  |
Other | 165,509 | 157,675 |  |
Total noncurrent assets | 7,649,033 | 7,359,492 |  |
Total assets | 9,660,781 | 8,910,435 | 8,053,372 |
Current liabilities: |  |  |  |
Accounts payable | 657,168 | 478,933 |  |
Taxes payable | 70,810 | 80,372 |  |
Dividends payable | 45,245 | 44,229 |  |
Accrued compensation | 88,662 | 81,904 |  |
Operating lease liabilities due within one year | 34,516 | 35,368 |  |
Other accrued liabilities | 232,231 | 207,078 |  |
Total current liabilities | 1,479,603 | 1,092,240 |  |
Noncurrent liabilities: |  |  |  |
Operating lease liabilities | 85,534 | 89,253 |  |
Other | 259,479 | 273,408 |  |
Total noncurrent liabilities | 4,594,049 | 4,435,321 |  |
Commitments and contingencies |  |  |  |
Commitments and Contingencies |  |  |  |
Stockholders' equity: |  |  |  |
Common stock | 204,163 | 203,889 |  |
Other paid-in capital | 1,466,037 | 1,461,205 |  |
Retained earnings | 1,951,138 | 1,762,410 |  |
Accumulated other comprehensive loss | (30,583) | (41,004) |  |
Treasury stock at cost - 538,921 shares | (3,626) | (3,626) |  |
Stockholders' Equity Attributable to Parent | 3,587,129 | 3,382,874 |  |
Total liabilities and stockholders' equity | $ 9,660,781 | $ 8,910,435 |  |
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 | 204,162,814 | 203,889,661 |  |
Treasury Stock, Common, Shares | 538,921 | 538,921 |  |
MDU Resources Group, Inc. [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | $ 19,486 | $ 6,159 | $ 8,781 | $ 12,326
Receivables, net | 4,410 | 6,120 |  |
Accounts receivable from subsidiaries | 53,285 | 49,696 |  |
Prepayments and other current assets | 3,237 | 2,528 |  |
Assets, Current | 80,418 | 64,503 |  |
Noncurrent Assets |  |  |  |
Investments | 50,206 | 55,686 |  |
Investment in subsidiaries | 3,581,754 | 3,368,537 |  |
Deferred income taxes | 12,668 | 7,364 |  |
Operating lease right-of-use assets | 72 | 114 |  |
Other | 2,068 | 26,558 |  |
Total noncurrent assets | 3,646,768 | 3,458,259 |  |
Total assets | 3,727,186 | 3,522,762 |  |
Current liabilities: |  |  |  |
Accounts payable | 2,354 | 2,546 |  |
Accounts payable to subsidiaries | 4,402 | 6,133 |  |
Taxes payable | 572 | 1,672 |  |
Dividends payable | 45,246 | 44,229 |  |
Accrued compensation | 4,312 | 4,098 |  |
Operating lease liabilities due within one year | 42 | 52 |  |
Other accrued liabilities | 17,907 | 7,309 |  |
Total current liabilities | 74,835 | 66,039 |  |
Noncurrent liabilities: |  |  |  |
Operating lease liabilities | 30 | 62 |  |
Other | 65,192 | 73,787 |  |
Total noncurrent liabilities | 65,222 | 73,849 |  |
Commitments and contingencies |  |  |  |
Commitments and Contingencies |  |  |  |
Stockholders' equity: |  |  |  |
Common stock | 204,163 | 203,889 |  |
Other paid-in capital | 1,466,037 | 1,461,205 |  |
Retained earnings | 1,951,138 | 1,762,410 |  |
Accumulated other comprehensive loss | (30,583) | (41,004) |  |
Treasury stock at cost - 538,921 shares | (3,626) | (3,626) |  |
Stockholders' Equity Attributable to Parent | 3,587,129 | 3,382,874 |  |
Total liabilities and stockholders' equity | $ 3,727,186 | $ 3,522,762 |  |
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 | 204,162,814 | 203,889,661 |  |
Treasury Stock, Common, Shares | 538,921 | 538,921 |  |

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