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Leases Capital Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Capital Leased Assets [Line Items]    
Capital Leases, Future Minimum Payments, Interest Included in Payments $ 11,452us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments  
Capital Lease Obligations 39,456us-gaap_CapitalLeaseObligationsNoncurrent 47,596us-gaap_CapitalLeaseObligationsNoncurrent
Capital Leases, Future Minimum Payments Due 58,872us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]    
Capital Leases, Future Minimum Payments Due, Current 11,074us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent  
Capital Leases, Future Minimum Payments Due in Two Years 9,761us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
Capital Leases, Future Minimum Payments Due in Three Years 8,774us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
Capital Leases, Future Minimum Payments Due in Four Years 8,269us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
Capital Leases, Future Minimum Payments Due in Five Years 7,511us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears  
Capital Leases, Future Minimum Payments Due Thereafter 13,483us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter  
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments 47,420us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments  
Capital Lease Obligations, Current $ 7,964us-gaap_CapitalLeaseObligationsCurrent