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Condensed Balance Sheets (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current assets:        
Cash and cash equivalents $ 84,591 $ 81,855 $ 57,340 $ 49,042
Receivables, net 590,105 599,186    
Inventories 253,727 289,410    
Deferred income taxes 32,849 32,012    
Prepayments and other current assets 35,189 83,763    
Total current assets 1,021,042 1,217,403    
Investments 119,704 117,883    
Property, plant and equipment 6,817,668 6,294,778    
Less accumulated depreciation, depletion and amortization 2,506,571 2,386,113 2,284,169  
Net property, plant and equipment 4,311,097 3,908,665 3,461,553  
Deferred charges and other assets:        
Goodwill [1] 635,204 635,204 636,039  
Other 366,485 322,943    
Total deferred charges and other assets 1,175,765 2,588,457    
Total assets 6,627,608 7,832,408 7,073,447  
Current liabilities:        
Long-term debt due within one year 243,789 268,552    
Accounts payable 310,466 279,115    
Taxes payable 45,775 39,955    
Dividends payable 36,784 35,607    
Accrued compensation 46,130 57,402    
Other accrued liabilities 171,592 155,765    
Total current liabilities 947,639 991,124    
Long-term debt 1,627,443 1,825,278    
Deferred credits and other liabilities:        
Deferred income taxes 720,319 714,022    
Other liabilities 811,659 756,759    
Total deferred credits and other liabilities 1,531,978 1,766,222    
Equity:        
Preferred stocks 15,000 15,000    
Authorized - 500,000,000 shares, $1.00 par value        
Issued - 195,804,665 shares in 2015 and 194,754,812 shares in 2014 195,805 194,755    
Other paid-in capital 1,230,119 1,207,188    
Retained earnings 996,355 1,762,827    
Accumulated other comprehensive loss (37,148) (42,103)    
Treasury stock at cost - 538,921 shares (3,626) (3,626)    
Total common stockholders' equity 2,381,505 3,119,041    
Total stockholders' equity 2,396,505 3,134,041    
Total liabilities and equity $ 6,627,608 $ 7,832,408    
Condensed Balance Sheet (Parenthetical)        
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, par value $ 1.00 $ 1.00    
Common stock, shares issued 195,804,665 194,754,812    
Treasury stock, shares 538,921 538,921    
MDU Resources Group, Inc. [Member]        
Current assets:        
Cash and cash equivalents $ 2,921 $ 6,120 $ 5,051 $ 3,596
Receivables, net 70,511 91,493    
Accounts receivable from subsidiaries 33,129 32,691    
Inventories 16,883 33,584    
Deferred income taxes 2,846 547    
Prepayments and other current assets 7,876 70,852    
Total current assets 134,166 235,287    
Investments 66,784 64,446    
Investment in subsidiaries 1,722,351 2,590,283    
Property, plant and equipment 2,378,994 1,984,956    
Less accumulated depreciation, depletion and amortization 711,209 660,026    
Net property, plant and equipment 1,667,785 1,324,930    
Deferred charges and other assets:        
Goodwill 4,812 4,812    
Other 186,187 163,408    
Total deferred charges and other assets 190,999 168,220    
Total assets 3,782,085 4,383,166    
Current liabilities:        
Long-term debt due within one year 109 109    
Accounts payable 54,275 48,088    
Accounts payable to subsidiaries 6,622 30,863    
Taxes payable 10,995 10,583    
Dividends payable 36,784 35,607    
Accrued compensation 7,539 11,227    
Other accrued liabilities 40,931 36,488    
Total current liabilities 157,255 172,965    
Long-term debt 625,155 508,164    
Deferred credits and other liabilities:        
Deferred income taxes 257,915 251,067    
Other liabilities 345,255 316,929    
Total deferred credits and other liabilities 603,170 567,996    
Equity:        
Preferred stocks 15,000 15,000    
Authorized - 500,000,000 shares, $1.00 par value        
Issued - 195,804,665 shares in 2015 and 194,754,812 shares in 2014 195,805 194,755    
Other paid-in capital 1,230,119 1,207,188    
Retained earnings 996,355 1,762,827    
Accumulated other comprehensive loss (37,148) (42,103)    
Treasury stock at cost - 538,921 shares (3,626) (3,626)    
Total common stockholders' equity 2,381,505 3,119,041    
Total stockholders' equity 2,396,505 3,134,041    
Total liabilities and equity $ 3,782,085 $ 4,383,166    
Condensed Balance Sheet (Parenthetical)        
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, par value $ 1.00 $ 1.00    
Common stock, shares issued 195,804,655 194,754,812    
Treasury stock, shares 538,921 538,921    
[1] Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.