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Operating Leases - Lessee (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Deferred Compensation Liability, Current and Noncurrent $ 27,600,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent $ 26,100,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent  
Operating leases expenses 8,900,000us-gaap_OperatingLeasesRentExpenseNet 8,500,000us-gaap_OperatingLeasesRentExpenseNet 9,100,000us-gaap_OperatingLeasesRentExpenseNet
Operating Leases, Future Minimum Payments Due [Abstract]      
2015 8,234us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 7,793us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 6,074us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 5,006us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 4,754us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 194,992us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 226,853us-gaap_OperatingLeasesFutureMinimumPaymentsDue