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Consolidated Statements of Equity (USD $) In Thousands, except Share data	Total	Preferred stock	Common Stock	Other Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling interest
Balance at Dec. 31, 2011	$ 2,775,567us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	$ 189,332us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 1,035,739us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 1,586,123us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (47,001)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (3,626)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance (in shares) at Dec. 31, 2011		150,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Balance (in shares) at Dec. 31, 2011			189,332,485us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock (in shares) at Dec. 31, 2011							(538,921)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income (loss) attributable to parent					(754)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net loss attributable to noncontrolling interest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss)	(754)us-gaap_ProfitLoss
Other comprehensive income (loss)	(1,720)us-gaap_OtherComprehensiveIncomeLossNetOfTax					(1,720)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends declared on preferred stocks	(685)us-gaap_DividendsPreferredStockCash				(685)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Dividends declared on common stock	(127,538)us-gaap_DividendsCommonStockCash				(127,538)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock-based compensation - shares			25,743us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation	5,120us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions		26us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	5,094us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Excess tax benefit (deficit) on stock-based compensation	(1,958)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation			(1,958)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of common stock - shares			11,222us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock	216us-gaap_StockIssuedDuringPeriodValueNewIssues		11us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	205us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance at Dec. 31, 2012	2,648,248us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	189,369us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,039,080us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	1,457,146us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(48,721)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(3,626)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance (in shares) at Dec. 31, 2012		150,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Treasury stock (in shares) at Dec. 31, 2012							(538,921)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance (in shares) at Dec. 31, 2012			189,369,450us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net income (loss) attributable to parent					278,933us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net loss attributable to noncontrolling interest	(363)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest							(363)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss)	278,570us-gaap_ProfitLoss
Other comprehensive income (loss)	10,516us-gaap_OtherComprehensiveIncomeLossNetOfTax					10,516us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends declared on preferred stocks	(685)us-gaap_DividendsPreferredStockCash				(685)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Dividends declared on common stock	(132,264)us-gaap_DividendsCommonStockCash				(132,264)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock-based compensation	5,281us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions			5,281us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Excess tax benefit (deficit) on stock-based compensation	(1,419)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation			(1,419)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of common stock - shares			499,330us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock	14,554us-gaap_StockIssuedDuringPeriodValueNewIssues		500us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	14,054us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Contribution from non-controlling interest	33,101us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance							33,101us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2013	2,855,902us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	189,869us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,056,996us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	1,603,130us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(38,205)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(3,626)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	32,738us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in shares) at Dec. 31, 2013		150,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Treasury stock (in shares) at Dec. 31, 2013	(538,921)us-gaap_TreasuryStockShares						(538,921)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance (in shares) at Dec. 31, 2013	189,868,780us-gaap_CommonStockSharesIssued		189,868,780us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net income (loss) attributable to parent					298,233us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net loss attributable to noncontrolling interest	(3,895)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest							(3,895)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss)	294,338us-gaap_ProfitLoss
Other comprehensive income (loss)	(3,898)us-gaap_OtherComprehensiveIncomeLossNetOfTax					(3,898)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends declared on preferred stocks	(685)us-gaap_DividendsPreferredStockCash				(685)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Dividends declared on common stock	(137,851)us-gaap_DividendsCommonStockCash				(137,851)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock-based compensation	6,191us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions			6,191us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			326,122mdu_ShareBasedCompensationSharesSharesIssuedNetOfTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	(5,564)mdu_ShareBasedCompensationValueIssuedSharesNetOfTaxWithholdings		326mdu_ShareBasedCompensationValueIssuedSharesNetOfTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(5,890)mdu_ShareBasedCompensationValueIssuedSharesNetOfTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Excess tax benefit (deficit) on stock-based compensation	4,729us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation			4,729us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of common stock - shares			4,559,910us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock	149,722us-gaap_StockIssuedDuringPeriodValueNewIssues		4,560us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	145,162us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Contribution from non-controlling interest	86,900us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance							86,900us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2014	$ 3,249,784us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	$ 194,755us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 1,207,188us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 1,762,827us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (42,103)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (3,626)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 115,743us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in shares) at Dec. 31, 2014		150,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Treasury stock (in shares) at Dec. 31, 2014	(538,921)us-gaap_TreasuryStockShares						(538,921)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance (in shares) at Dec. 31, 2014	194,754,812us-gaap_CommonStockSharesIssued		194,754,812us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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