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Income Taxes Net Deferred Tax assets/Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits $ 283,188,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits $ 337,836,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations 63,640,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 37,306,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred Tax Assets, Property, Plant and Equipment 19,267,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 22,489,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Equity Method Investments 28,316,000us-gaap_DeferredTaxAssetsEquityMethodInvestments 0us-gaap_DeferredTaxAssetsEquityMethodInvestments
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 152,149,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 159,933,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits 45,926,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 44,580,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 32,949,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 31,008,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 43,505,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 14,330,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred Tax Assets, Operating Loss Carryforwards 49,638,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 168,658,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 38,456,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 35,655,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 14,380,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 20,978,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred Tax Assets, Other 159,300,000us-gaap_DeferredTaxAssetsOther 160,567,000us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 930,714,000us-gaap_DeferredTaxAssetsGross 1,033,340,000us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance 6,096,000us-gaap_DeferredTaxAssetsValuationAllowance 7,532,000us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets 924,618,000us-gaap_DeferredTaxAssetsNet 1,025,808,000us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Property, Plant and Equipment (1,065,791,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (954,007,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Derivatives (74,898,000)us-gaap_DeferredTaxLiabilitiesDerivatives (27,741,000)us-gaap_DeferredTaxLiabilitiesDerivatives
Deferred Tax Liabilities, Leasing Arrangements (37,621,000)us-gaap_DeferredTaxLiabilitiesLeasingArrangements (38,105,000)us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates 0us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (27,431,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Deferred Tax Liabilities, Other (5,331,000)us-gaap_DeferredTaxLiabilitiesOther (9,864,000)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross (1,183,641,000)us-gaap_DeferredIncomeTaxLiabilities (1,057,148,000)us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Liabilities, Net (259,023,000)us-gaap_DeferredTaxLiabilities (31,340,000)us-gaap_DeferredTaxLiabilities
Deferred Federal Income Tax Expense (Benefit) 49,638us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 51,765us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferred Tax Assets, Valuation Allowance, Noncurrent (6,080,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (7,528,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 16,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 4,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount