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Income Taxes Effective Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Rate
Dec. 31, 2012
Rate
Effective Tax Rate Reconciliation [Abstract]      
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 64,093us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 16,126us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 142,340us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount (43,140)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (51,104)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (49,572)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Percent (23.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion (110.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion (12.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Amount 631us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy 2,112us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy 2,112us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsMedicarePrescriptionDrugBenefit 4.60%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsMedicarePrescriptionDrugBenefit 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsMedicarePrescriptionDrugBenefit
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount (1,522)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities 5,680us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (7,215)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities 12.30%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount (8,331)us-gaap_IncomeTaxReconciliationTaxContingencies (1,406)us-gaap_IncomeTaxReconciliationTaxContingencies 6,004us-gaap_IncomeTaxReconciliationTaxContingencies
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent (4.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (3.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount (5,124)us-gaap_IncomeTaxReconciliationTaxSettlements 3us-gaap_IncomeTaxReconciliationTaxSettlements (925)us-gaap_IncomeTaxReconciliationTaxSettlements
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount 5,249us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (2,399)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (8,737)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (5.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (1,436)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (4,659)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (10.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 1,411us-gaap_IncomeTaxReconciliationTaxCreditsForeign 0us-gaap_IncomeTaxReconciliationTaxCreditsForeign 1,765us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount 2,516us-gaap_IncomeTaxReconciliationDeductionsOther 2,458us-gaap_IncomeTaxReconciliationDeductionsOther 2,956us-gaap_IncomeTaxReconciliationDeductionsOther
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther 5.30%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Income Tax Expense (Benefit) $ 14,347us-gaap_IncomeTaxExpenseBenefit $ (33,189)us-gaap_IncomeTaxExpenseBenefit $ 88,728us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent 7.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (72.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 21.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations