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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Operating Leased Assets [Line Items]  
Term of typical renewal options on land and building leases 5 years
Capital Commitments:  
2015 $ 6,451us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016 5,561us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017 4,967us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018 3,738us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019 2,970us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 9,306us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total 32,993us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less imputed interest 14,180us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Present value of capital lease obligations 18,813us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Operating Commitments:  
2015 31,904us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 29,473us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 26,658us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 22,376us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 18,145us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 65,611us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total 194,167us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating Lease Receipts:  
2015 30,610us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
2016 28,546us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
2017 26,531us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
2018 23,072us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
2019 19,062us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter 97,165us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Total $ 224,986us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Minimum [Member]  
Operating Leased Assets [Line Items]  
Initial terms of land and building leases 10 years
Maximum [Member]  
Operating Leased Assets [Line Items]  
Initial terms of land and building leases 15 years