Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Maturities of debt
Debt, 2014	$ 251,315
Capital leases, 2014	9,383
Debt, 2015	712,305
Capital leases, 2015	8,096
Debt, 2016	872,994
Capital leases, 2016	6,505
Debt, 2017	704,270
Capital leases, 2017	7,602
Debt, 2018	1,185,649
Capital leases, 2018	5,807
Debt, Thereafter	415,810
Capital leases, Thereafter	4,987
Debt, Total	4,142,343
Capital leases, Total	42,380
Imputed interest	(3,469)
Present value of minimum capitalized lease payments	38,911
Current portion	(8,123)
Long-term capitalized lease obligation	$ 30,788

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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.