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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 | $ 2,775,567 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 15,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 189,332 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,035,739 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,586,123 us-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 |  | 150,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2011 |  |  | 189,332,485 us-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 | 0 us-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 |  |  | 25,743 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock-based compensation | 5,120 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  | 26 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,094 us-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 |  |  | 11,222 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common stock | 216 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 11 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 205 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Balance at Dec. 31, 2012 | 2,648,248 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 15,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 189,369 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,039,080 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,457,146 us-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 |  | 150,000 us-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 |  |  | 189,369,450 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income (loss) attributable to parent |  |  |  |  | 278,933 us-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) | 278,570 us-gaap_ProfitLoss |  |  |  |  |  |  |
Other comprehensive income (loss) | 10,516 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | 10,516 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 | (132,264)us-gaap_DividendsCommonStockCash |  |  |  | (132,264)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Stock-based compensation | 5,281 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  |  | 5,281 us-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 |  |  | 499,330 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common stock | 14,554 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 500 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,054 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Contribution from non-controlling interest | 33,101 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance |  |  |  |  |  |  | 33,101 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2013 | 2,855,902 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 15,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 189,869 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,056,996 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,603,130 us-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 | 32,738 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in shares) at Dec. 31, 2013 |  | 150,000 us-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 | 189,868,780 us-gaap_CommonStockSharesIssued |  | 189,868,780 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income (loss) attributable to parent |  |  |  |  | 298,233 us-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) | 294,338 us-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 | 6,191 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  |  | 6,191 us-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 |  |  | 326,122 mdu_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 |  | 326 mdu_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 | 4,729 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 4,729 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of common stock - shares |  |  | 4,559,910 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common stock | 149,722 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 4,560 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 145,162 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Contribution from non-controlling interest | 86,900 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance |  |  |  |  |  |  | 86,900 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2014 | $ 3,249,784 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 15,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 194,755 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,207,188 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,762,827 us-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 | $ 115,743 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in shares) at Dec. 31, 2014 |  | 150,000 us-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 | 194,754,812 us-gaap_CommonStockSharesIssued |  | 194,754,812 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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