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Income Taxes - Provision and reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 17,347us-gaap_CurrentFederalTaxExpenseBenefit $ 712us-gaap_CurrentFederalTaxExpenseBenefit $ (3,994)us-gaap_CurrentFederalTaxExpenseBenefit
State 1,774us-gaap_CurrentStateAndLocalTaxExpenseBenefit (190)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 289us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) 19,121us-gaap_CurrentIncomeTaxExpenseBenefit 522us-gaap_CurrentIncomeTaxExpenseBenefit (3,705)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 2,025us-gaap_DeferredFederalIncomeTaxExpenseBenefit 5,582us-gaap_DeferredFederalIncomeTaxExpenseBenefit 7,375us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 890us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,274us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 474us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 2,915us-gaap_DeferredIncomeTaxExpenseBenefit 6,856us-gaap_DeferredIncomeTaxExpenseBenefit 7,849us-gaap_DeferredIncomeTaxExpenseBenefit
Reconciliation of income tax expense computed at the federal statutory rate to the provision for income taxes      
Federal income tax expense at statutory rate 21,699us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 6,656us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 3,555us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 1,694us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 236us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 218us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Valuation allowance changes     451us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in uncertain tax positions, net 8us-gaap_IncomeTaxReconciliationTaxContingencies 8us-gaap_IncomeTaxReconciliationTaxContingencies 8us-gaap_IncomeTaxReconciliationTaxContingencies
Research and development credit (249)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (305)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (26)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Rate change 366us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 758us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 67us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Manufacturing tax benefits (1,612)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (44)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities  
Other 130us-gaap_IncomeTaxReconciliationOtherAdjustments 69us-gaap_IncomeTaxReconciliationOtherAdjustments (129)us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income tax expense (benefit) $ 22,036us-gaap_IncomeTaxExpenseBenefit $ 7,378us-gaap_IncomeTaxExpenseBenefit $ 4,144us-gaap_IncomeTaxExpenseBenefit