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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes (Textual)      
Cash payments for income taxes $ 30,800,000us-gaap_IncomeTaxesPaid $ 26,500,000us-gaap_IncomeTaxesPaid $ 47,400,000us-gaap_IncomeTaxesPaid
Tax expense (benefits) related to interest and penalties 100,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 400,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense  
Amount of interest and penalties 300,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 400,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued  
Reduction of unrecognized tax benefits in the next twelve months, due to expiration of applicable statues of limitation 400,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit    
Unrecognized tax benefits favorably affecting Company's effective tax rate 2,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Unrecognized tax benefits $ 2,936,000us-gaap_UnrecognizedTaxBenefits $ 1,745,000us-gaap_UnrecognizedTaxBenefits