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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Rental expense $ 55,000,000us-gaap_LeaseAndRentalExpense $ 67,000,000us-gaap_LeaseAndRentalExpense $ 68,000,000us-gaap_LeaseAndRentalExpense
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 47,496,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 35,864,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 26,306,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 19,899,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 14,313,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 67,726,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total minimum lease payments $ 211,604,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue