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v2.4.1.9

Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating revenues: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | $ 1,366,356 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesRevenues |  | $ 1,264,574 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesRevenues |  | $ 1,131,626 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesRevenues |
Exploration and production, construction materials and contracting, construction services and other | 3,304,202 mdu_ExplorationAndProductionConstructionMaterialsAndContractingConstructionServicesAndOtherRevenues |  | 3,197,830 mdu_ExplorationAndProductionConstructionMaterialsAndContractingConstructionServicesAndOtherRevenues |  | 2,943,805 mdu_ExplorationAndProductionConstructionMaterialsAndContractingConstructionServicesAndOtherRevenues |
Total operating revenues | 4,670,558 us-gaap_Revenues |  | 4,462,404 us-gaap_Revenues |  | 4,075,431 us-gaap_Revenues |
Operating expenses: |  |  |  |  |  |
Fuel and purchased power | 89,312 us-gaap_CostOfPurchasedPower |  | 83,528 us-gaap_CostOfPurchasedPower |  | 72,380 us-gaap_CostOfPurchasedPower |
Purchased natural gas sold | 570,041 us-gaap_CostOfNaturalGasPurchases |  | 505,065 us-gaap_CostOfNaturalGasPurchases |  | 425,220 us-gaap_CostOfNaturalGasPurchases |
Operation and maintenance: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | 303,822 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesOperationAndMaintenanceExpense |  | 269,825 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesOperationAndMaintenanceExpense |  | 254,194 mdu_ElectricNaturalGasDistributionAndPipelineAndEnergyServicesOperationAndMaintenanceExpense |
Exploration and production, construction materials and contracting, construction services and other | 2,625,228 mdu_ExplorationAndProductionConstructionMaterialsAndContractingAndConstructionServicesOtherOperationAndMaintenanceExpense |  | 2,535,872 mdu_ExplorationAndProductionConstructionMaterialsAndContractingAndConstructionServicesOtherOperationAndMaintenanceExpense |  | 2,377,285 mdu_ExplorationAndProductionConstructionMaterialsAndContractingAndConstructionServicesOtherOperationAndMaintenanceExpense |
Depreciation, depletion and amortization | 401,368 us-gaap_DepreciationDepletionAndAmortization |  | 386,856 us-gaap_DepreciationDepletionAndAmortization |  | 359,205 us-gaap_DepreciationDepletionAndAmortization |
Taxes, other than income | 192,562 us-gaap_TaxesExcludingIncomeAndExciseTaxes |  | 188,359 us-gaap_TaxesExcludingIncomeAndExciseTaxes |  | 176,140 us-gaap_TaxesExcludingIncomeAndExciseTaxes |
Write-downs of oil and natural gas properties (Note 1) | 0 us-gaap_ImpairmentOfOilAndGasProperties |  | 0 us-gaap_ImpairmentOfOilAndGasProperties |  | 391,800 us-gaap_ImpairmentOfOilAndGasProperties |
Total operating expenses | 4,182,333 us-gaap_OperatingExpenses |  | 3,969,505 us-gaap_OperatingExpenses |  | 4,056,224 us-gaap_OperatingExpenses |
Operating income | 488,225 us-gaap_OperatingIncomeLoss |  | 492,899 us-gaap_OperatingIncomeLoss |  | 19,207 us-gaap_OperatingIncomeLoss |
Earnings (loss) from equity method investments | (41)us-gaap_IncomeLossFromEquityMethodInvestments |  | (132)us-gaap_IncomeLossFromEquityMethodInvestments |  | 5,383 us-gaap_IncomeLossFromEquityMethodInvestments |
Other income | 9,962 us-gaap_OtherNonoperatingIncomeExpense |  | 6,768 us-gaap_OtherNonoperatingIncomeExpense |  | 6,642 us-gaap_OtherNonoperatingIncomeExpense |
Interest expense | 87,016 us-gaap_InterestExpense |  | 83,917 us-gaap_InterestExpense |  | 76,699 us-gaap_InterestExpense |
Income (loss) before income taxes | 411,130 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 415,618 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | (45,467)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
Income taxes | 119,969 us-gaap_IncomeTaxExpenseBenefit |  | 136,736 us-gaap_IncomeTaxExpenseBenefit |  | (31,146)us-gaap_IncomeTaxExpenseBenefit |
Income (loss) from continuing operations | 291,161 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 278,882 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | (14,321)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Income (loss) from discontinued operations, net of tax (Note 3) | 3,177 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | (312)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | 13,567 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1]
Net income (loss) | 294,338 us-gaap_ProfitLoss |  | 278,570 us-gaap_ProfitLoss |  | (754)us-gaap_ProfitLoss |
Net loss attributable to noncontrolling interest | (3,895)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | (363)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Dividends declared on preferred stocks | 685 us-gaap_PreferredStockDividendsIncomeStatementImpact |  | 685 us-gaap_PreferredStockDividendsIncomeStatementImpact |  | 685 us-gaap_PreferredStockDividendsIncomeStatementImpact |
Earnings (loss) on common stock | $ 297,548 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 278,248 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ (1,439)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Earnings (loss) per common share - basic: |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ 1.53 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.47 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Discontinued operations, net of tax | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Earnings (loss) per common share - basic | $ 1.55 us-gaap_EarningsPerShareBasic |  | $ 1.47 us-gaap_EarningsPerShareBasic |  | $ (0.01)us-gaap_EarningsPerShareBasic |
Earnings (loss) per common share - diluted: |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ 1.53 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.47 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Discontinued operations, net of tax | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Earnings (loss) per common share - diluted | $ 1.55 us-gaap_EarningsPerShareDiluted |  | $ 1.47 us-gaap_EarningsPerShareDiluted |  | $ (0.01)us-gaap_EarningsPerShareDiluted |
Weighted average common shares outstanding - basic | 192,507 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 188,855 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 188,826 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Weighted average common shares outstanding - diluted | 192,587 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 189,693 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 188,826 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
[1] | Reflected in the Other category.

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- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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