Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Maturities of debt
Debt, 2013	$ 359,821
Capital leases, 2013	8,210
Debt, 2014	339,339
Capital leases, 2014	7,710
Debt, 2015	727,897
Capital leases, 2015	6,910
Debt, 2016	1,117,289
Capital leases, 2016	5,771
Debt, 2017	704,062
Capital leases, 2017	7,140
Debt, Thereafter	513,645
Capital leases, Thereafter	10,942
Debt, Total	3,762,053
Capital leases, Total	46,683
Imputed interest	(4,665)
Present value of minimum capitalized lease payments	42,018
Current portion	(6,841)
Long-term capitalized lease obligation	$ 35,177

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.