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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating revenues:    
Electric, natural gas distribution and pipeline and energy services $ 427,444mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesRevenues $ 491,541mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesRevenues
Exploration and production, construction materials and contracting, construction services and other 491,066mdu_ExplorationAndProductionConstructionMaterialsAndContractingConstructionServicesAndOtherRevenues 551,312mdu_ExplorationAndProductionConstructionMaterialsAndContractingConstructionServicesAndOtherRevenues
Total operating revenues 918,510us-gaap_Revenues 1,042,853us-gaap_Revenues
Operating expenses:    
Fuel and purchased power 23,819us-gaap_CostOfPurchasedPower 26,544us-gaap_CostOfPurchasedPower
Purchased natural gas sold 202,960mdu_PurchasedNaturalGasSold 244,892mdu_PurchasedNaturalGasSold
Cost of crude oil 2,270us-gaap_RefiningAndMarketingCosts 0us-gaap_RefiningAndMarketingCosts
Operation and maintenance:    
Electric, natural gas distribution and pipeline and energy services 79,425mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesOperationAndMaintenanceExpense 67,284mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesOperationAndMaintenanceExpense
Exploration and production, construction materials and contracting, construction services and other 440,993mdu_ExplorationAndProductionConstructionMaterialsAndContractingAndConstructionServicesOtherOperationAndMaintenanceExpense 445,951mdu_ExplorationAndProductionConstructionMaterialsAndContractingAndConstructionServicesOtherOperationAndMaintenanceExpense
Depreciation, depletion and amortization 95,507us-gaap_DepreciationDepletionAndAmortization 99,557us-gaap_DepreciationDepletionAndAmortization
Taxes, other than income 47,483us-gaap_TaxesExcludingIncomeAndExciseTaxes 55,721us-gaap_TaxesExcludingIncomeAndExciseTaxes
Write-down of oil and natural gas properties 500,400us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties
Total operating expenses 1,392,857us-gaap_OperatingExpenses 939,949us-gaap_OperatingExpenses
Operating income (loss) (474,347)us-gaap_OperatingIncomeLoss 102,904us-gaap_OperatingIncomeLoss
Other income 2,324us-gaap_OtherNonoperatingIncomeExpense 2,183us-gaap_OtherNonoperatingIncomeExpense
Interest expense 23,149us-gaap_InterestExpense 20,971us-gaap_InterestExpense
Income (loss) before income taxes (495,172)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 84,116us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes (185,727)us-gaap_IncomeTaxExpenseBenefit 27,932us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations (309,445)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 56,184us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Loss from discontinued operations, net of tax (Note 10) 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (45)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) (309,445)us-gaap_ProfitLoss 56,139us-gaap_ProfitLoss
Net loss attributable to noncontrolling interest (3,528)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (523)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Dividends declared on preferred stocks 171us-gaap_PreferredStockDividendsIncomeStatementImpact 171us-gaap_PreferredStockDividendsIncomeStatementImpact
Earnings (loss) on common stock $ (306,088)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 56,491us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings (loss) per common share - basic:    
Earnings (loss) before discontinued operations $ (1.57)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.30us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations, net of tax $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Earnings (loss) per common share - basic $ (1.57)us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic
Earnings (loss) per common share - diluted:    
Earnings (loss) before discontinued operations $ (1.57)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.30us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations, net of tax $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Earnings (loss) per common share - diluted $ (1.57)us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted
Dividends declared per common share $ 0.1825us-gaap_CommonStockDividendsPerShareDeclared $ 0.1775us-gaap_CommonStockDividendsPerShareDeclared
Weighted average common shares outstanding - basic 194,479us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 189,820us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common shares outstanding - diluted 194,479us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 190,432us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding