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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes      
Net cash paid for taxes $ 120,500,000us-gaap_IncomeTaxesPaidNet $ 72,400,000us-gaap_IncomeTaxesPaidNet $ 46,900,000us-gaap_IncomeTaxesPaidNet
Income tax expense (benefit)      
Current income tax expense 94,312,000us-gaap_CurrentIncomeTaxExpenseBenefit 72,599,000us-gaap_CurrentIncomeTaxExpenseBenefit 11,334,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) (21,159,000)us-gaap_DeferredIncomeTaxExpenseBenefit 26,715,000us-gaap_DeferredIncomeTaxExpenseBenefit 50,451,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 73,153,000us-gaap_IncomeTaxExpenseBenefit 99,314,000us-gaap_IncomeTaxExpenseBenefit 61,785,000us-gaap_IncomeTaxExpenseBenefit
Effective tax rate      
Statutory federal tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit (as a percent) 4.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Domestic manufacturing deduction (as a percent) (4.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Noncontrolling interests (as a percent) 13.90%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Federal research and development tax credits (as a percent) (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch  
Audit settlements (as a percent)     (9.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Other permanent differences (as a percent) (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (as a percent) 44.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets      
Accrued expenses and allowances 22,780,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 23,497,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Inventories 20,546,000us-gaap_DeferredTaxAssetsInventory 3,621,000us-gaap_DeferredTaxAssetsInventory  
Net operating loss carryforwards 33,347,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 18,690,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other 5,571,000us-gaap_DeferredTaxAssetsOther 6,238,000us-gaap_DeferredTaxAssetsOther  
Subtotal 82,244,000us-gaap_DeferredTaxAssetsGross 52,046,000us-gaap_DeferredTaxAssetsGross  
Less: valuation allowance (21,586,000)us-gaap_DeferredTaxAssetsValuationAllowance (10,641,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Total net deferred tax assets 60,658,000us-gaap_DeferredTaxAssetsNet 41,405,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities      
Property, plant and equipment (449,939,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (474,088,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Intangible assets (108,840,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (94,936,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Other (8,359,000)us-gaap_DeferredTaxLiabilitiesOther (10,426,000)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities (567,138,000)us-gaap_DeferredIncomeTaxLiabilities (579,450,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liability (506,480,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (538,045,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Federal      
Operating loss carryforwards      
Net operating loss carryforwards $ 56,300,000us-gaap_OperatingLossCarryforwards
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