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Income Taxes Effective Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 64,093 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 16,126 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 142,340 us-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 | 631 us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy | 2,112 us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy | 2,112 us-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 | 5,680 us-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 | 6,004 us-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 | 3 us-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 | 5,249 us-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 | 0 us-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 | 1,411 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | 0 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | 1,765 us-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 | 2,516 us-gaap_IncomeTaxReconciliationDeductionsOther | 2,458 us-gaap_IncomeTaxReconciliationDeductionsOther | 2,956 us-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) | $ 14,347 us-gaap_IncomeTaxExpenseBenefit | $ (33,189)us-gaap_IncomeTaxExpenseBenefit | $ 88,728 us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent | 7.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (72.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | 21.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depletion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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