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Rental Expense and Lease Commitments (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rental Expense and Lease Commitments      
Rent expense $ 22,600,000us-gaap_LeaseAndRentalExpense $ 22,500,000us-gaap_LeaseAndRentalExpense $ 21,900,000us-gaap_LeaseAndRentalExpense
Future minimum rental commitments under non-cancelable operating leases      
2015 21,927,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 18,688,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 14,410,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 10,121,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 5,634,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 14,353,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 85,133,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue