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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 80,517 $ 54,161
Receivables, net 1,305,642 946,741
Inventories 387,525 335,609
Current regulatory assets 165,092 118,691
Prepayments and other current assets 72,972 95,741
Total current assets 2,011,748 1,550,943
Noncurrent assets:    
Property, plant and equipment 9,364,038 8,972,849
Less accumulated depreciation, depletion and amortization 3,272,493 3,216,461
Net property, plant and equipment 6,091,545 5,756,388
Goodwill 763,500 765,386
Other intangible assets, net 17,532 22,578
Regulatory assets 329,659 357,851
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
Current liabilities:    
Short-term borrowings 246,500 0
Long-term debt due within one year 78,031 148,053
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
Regulatory liabilities due within one year 26,440 16,303
Other accrued liabilities 232,231 207,078
Total current liabilities 1,479,603 1,092,240
Noncurrent liabilities:    
Long-term debt 2,763,394 2,593,847
Deferred income taxes 631,303 591,962
Asset retirement obligations 405,885 458,061
Regulatory liabilities 448,454 428,790
Operating lease liabilities 85,534 89,253
Other 259,479 273,408
Total noncurrent liabilities 4,594,049 4,435,321
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)
Total stockholders' equity 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 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
Receivables, net 4,410 6,120
Prepayments and other current assets 3,237 2,528
Total current assets 80,418 64,503
Noncurrent assets:    
Investments 50,206 55,686
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
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
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)
Total stockholders' equity 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 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