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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Operating leases, rent expense $ 17,500,000us-gaap_LeaseAndRentalExpense $ 15,100,000us-gaap_LeaseAndRentalExpense $ 14,300,000us-gaap_LeaseAndRentalExpense
Future Minimum Lease Payments [Abstract]      
2015 13,042,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 9,909,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 9,583,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 9,142,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 8,819,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 32,854,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 83,349,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue