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v2.4.1.9

Income Taxes Net Deferred Tax assets/Liabilities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | $ 283,188,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | $ 337,836,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | 63,640,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations | 37,306,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred Tax Assets, Property, Plant and Equipment | 19,267,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 22,489,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Equity Method Investments | 28,316,000 us-gaap_DeferredTaxAssetsEquityMethodInvestments | 0 us-gaap_DeferredTaxAssetsEquityMethodInvestments
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 152,149,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 159,933,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 45,926,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 44,580,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other | 32,949,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther | 31,008,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 43,505,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 14,330,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred Tax Assets, Operating Loss Carryforwards | 49,638,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 168,658,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 38,456,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 35,655,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | 14,380,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 20,978,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred Tax Assets, Other | 159,300,000 us-gaap_DeferredTaxAssetsOther | 160,567,000 us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross | 930,714,000 us-gaap_DeferredTaxAssetsGross | 1,033,340,000 us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance | 6,096,000 us-gaap_DeferredTaxAssetsValuationAllowance | 7,532,000 us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets | 924,618,000 us-gaap_DeferredTaxAssetsNet | 1,025,808,000 us-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 | 0 us-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) | 49,638 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 51,765 us-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 | $ 16,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 4,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments in unconsolidated subsidiaries and investments in other affiliates which are not controlled nor consolidated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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