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Quarterly Financial Information (Unaudited) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,163,204,000 us-gaap_Revenues | $ 1,370,455,000 us-gaap_Revenues | $ 1,094,046,000 us-gaap_Revenues | $ 1,042,853,000 us-gaap_Revenues | $ 1,184,423,000 us-gaap_Revenues | $ 1,285,782,000 us-gaap_Revenues | $ 1,060,595,000 us-gaap_Revenues | $ 931,604,000 us-gaap_Revenues | $ 4,670,558,000 us-gaap_Revenues |  | $ 4,462,404,000 us-gaap_Revenues |  | $ 4,075,431,000 us-gaap_Revenues |
Total operating expenses | 1,053,582,000 us-gaap_OperatingExpenses | 1,193,690,000 us-gaap_OperatingExpenses | 995,112,000 us-gaap_OperatingExpenses | 939,949,000 us-gaap_OperatingExpenses | 1,037,306,000 us-gaap_OperatingExpenses | 1,135,909,000 us-gaap_OperatingExpenses | 969,217,000 us-gaap_OperatingExpenses | 827,073,000 us-gaap_OperatingExpenses | 4,182,333,000 us-gaap_OperatingExpenses |  | 3,969,505,000 us-gaap_OperatingExpenses |  | 4,056,224,000 us-gaap_OperatingExpenses |
Operating income | 109,622,000 us-gaap_OperatingIncomeLoss | 176,765,000 us-gaap_OperatingIncomeLoss | 98,934,000 us-gaap_OperatingIncomeLoss | 102,904,000 us-gaap_OperatingIncomeLoss | 147,117,000 us-gaap_OperatingIncomeLoss | 149,873,000 us-gaap_OperatingIncomeLoss | 91,378,000 us-gaap_OperatingIncomeLoss | 104,531,000 us-gaap_OperatingIncomeLoss | 488,225,000 us-gaap_OperatingIncomeLoss |  | 492,899,000 us-gaap_OperatingIncomeLoss |  | 19,207,000 us-gaap_OperatingIncomeLoss |
Income from continuing operations | 80,079,000 us-gaap_IncomeLossFromContinuingOperations | 102,118,000 us-gaap_IncomeLossFromContinuingOperations | 52,780,000 us-gaap_IncomeLossFromContinuingOperations | 56,184,000 us-gaap_IncomeLossFromContinuingOperations | 91,348,000 us-gaap_IncomeLossFromContinuingOperations | 84,550,000 us-gaap_IncomeLossFromContinuingOperations | 46,392,000 us-gaap_IncomeLossFromContinuingOperations | 56,592,000 us-gaap_IncomeLossFromContinuingOperations | 291,161,000 us-gaap_IncomeLossFromContinuingOperations |  | 278,882,000 us-gaap_IncomeLossFromContinuingOperations |  | (14,321,000)us-gaap_IncomeLossFromContinuingOperations |
Income (loss) from discontinued operations, net of tax | 2,672,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 547,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (45,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (58,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (118,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (59,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (77,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3,177,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | (312,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | 13,567,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1]
Net income (loss) attributable to parent | 84,256,000 us-gaap_NetIncomeLoss | 103,209,000 us-gaap_NetIncomeLoss | 54,106,000 us-gaap_NetIncomeLoss | 56,662,000 us-gaap_NetIncomeLoss | 91,450,000 us-gaap_NetIncomeLoss | 84,456,000 us-gaap_NetIncomeLoss | 46,512,000 us-gaap_NetIncomeLoss | 56,515,000 us-gaap_NetIncomeLoss |  |  |  |  |  |
Earnings (loss) per common share - basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before discontinued operations | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.53 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.48 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.45 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.53 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.47 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Discontinued operations, net of tax | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Earnings (loss) per common share - basic | $ 0.43 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 1.55 us-gaap_EarningsPerShareBasic |  | $ 1.47 us-gaap_EarningsPerShareBasic |  | $ (0.01)us-gaap_EarningsPerShareBasic |
Earnings per common share - diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before discontinued operations | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.53 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.48 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.44 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.24 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.53 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.47 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Discontinued operations, net of tax | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Earnings (loss) per common share - diluted | $ 0.43 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 1.55 us-gaap_EarningsPerShareDiluted |  | $ 1.47 us-gaap_EarningsPerShareDiluted |  | $ (0.01)us-gaap_EarningsPerShareDiluted |
Weighted average common shares outstanding - basic | 194,136 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 193,949 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 192,060 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 189,820 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 188,929 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 188,831 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 188,831 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 188,831 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 192,507 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 188,855 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 188,826 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Weighted average common shares outstanding - diluted | 194,219 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 194,300 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 192,659 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 190,432 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 189,766 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 189,638 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 189,463 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 189,222 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 192,587 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 189,693 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 188,826 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Unrealized gain (loss) on commodity derivatives | 4,100,000 mdu_UnrealizedGainLossonCommodityContractsNetofTax | 18,100,000 mdu_UnrealizedGainLossonCommodityContractsNetofTax | (3,300,000)mdu_UnrealizedGainLossonCommodityContractsNetofTax | (4,300,000)mdu_UnrealizedGainLossonCommodityContractsNetofTax | (500,000)mdu_UnrealizedGainLossonCommodityContractsNetofTax | (7,900,000)mdu_UnrealizedGainLossonCommodityContractsNetofTax | 8,200,000 mdu_UnrealizedGainLossonCommodityContractsNetofTax | (3,700,000)mdu_UnrealizedGainLossonCommodityContractsNetofTax |  |  |  |  |  |
MEPP withdrawal liability, after tax | 8,400,000 mdu_EstimatedMultiemployerPlanWithdrawalObligationAfterTax |  |  |  |  |  |  |  | 8,400,000 mdu_EstimatedMultiemployerPlanWithdrawalObligationAfterTax |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 9,000,000 us-gaap_AssetImpairmentCharges |  |  |  | 9,000,000 us-gaap_AssetImpairmentCharges |  | 1,700,000 us-gaap_AssetImpairmentCharges |
Reversal of an arbitration charge after tax |  |  |  |  | $ 1,500,000 mdu_ReversalOfArbitrationChargeAfterTax |  |  |  |  |  | $ 1,500,000 mdu_ReversalOfArbitrationChargeAfterTax |  | $ 15,000,000 mdu_ReversalOfArbitrationChargeAfterTax |
[1] | Reflected in the Other category.

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