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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current        
Current Federal $ 26,296,000us-gaap_CurrentFederalTaxExpenseBenefit $ 21,916,000us-gaap_CurrentFederalTaxExpenseBenefit $ 25,110,000us-gaap_CurrentFederalTaxExpenseBenefit  
Current State (796,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,731,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,627,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit  
Current Foreign 905,000us-gaap_CurrentForeignTaxExpenseBenefit 1,768,000us-gaap_CurrentForeignTaxExpenseBenefit 1,123,000us-gaap_CurrentForeignTaxExpenseBenefit  
Current Income Tax Expense (Benefit) 26,405,000us-gaap_CurrentIncomeTaxExpenseBenefit 27,415,000us-gaap_CurrentIncomeTaxExpenseBenefit 27,860,000us-gaap_CurrentIncomeTaxExpenseBenefit  
Deferred        
Deferred Federal 5,256,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 5,688,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (455,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit  
Deferred State (380,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (270,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 915,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit  
Deferred Foreign (559,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,245,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,572,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit  
Deferred Income Tax Expense (Benefit) 4,317,000us-gaap_DeferredIncomeTaxExpenseBenefit 4,173,000us-gaap_DeferredIncomeTaxExpenseBenefit (1,112,000)us-gaap_DeferredIncomeTaxExpenseBenefit  
Total Income Tax Expense (Benefit) 30,722,000us-gaap_IncomeTaxExpenseBenefit 31,588,000us-gaap_IncomeTaxExpenseBenefit 26,748,000us-gaap_IncomeTaxExpenseBenefit  
Cash payments of income taxes, net of refunds 22,800,000us-gaap_IncomeTaxesPaidNet 33,100,000us-gaap_IncomeTaxesPaidNet 26,900,000us-gaap_IncomeTaxesPaidNet  
Income Tax Contingency [Line Items]        
Federal Statutory Income Tax Rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Unrecognized Tax Benefits 2,441,000us-gaap_UnrecognizedTaxBenefits 2,302,000us-gaap_UnrecognizedTaxBenefits 3,886,000us-gaap_UnrecognizedTaxBenefits 4,388,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 1,700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate