Debt - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital lease obligations and sale-leaseback financings	$ 172,684	$ 234,356
Total long-term debt	3,084,467	3,468,938
Less: total unamortized deferred financing costs	100,395	107,640
Less: current portion of long-term debt	131,738	154,234
Long-term debt, less current portion	2,852,334	3,207,064
Senior Notes
Debt Instrument [Line Items]
Total senior and other debt	800,000	800,000
Lines of credit
Debt Instrument [Line Items]
Total senior and other debt	60,915	55,799
Notes payable and other debt
Debt Instrument [Line Items]
Total senior and other debt	758,416	753,439
Senior and Other Debt
Debt Instrument [Line Items]
Total senior and other debt	2,911,783	3,234,582
Senior Long-term Debt
Debt Instrument [Line Items]
Total senior and other debt	2,092,452	2,425,344
Secured Credit Facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Total senior and other debt	1,292,452	$ 1,625,344
Disposal Group, Held-for-sale, Not Discontinued Operations
Debt Instrument [Line Items]
Long-term debt, including current portion	$ 78,289

Debt Instrument Carrying Before Debt Issuance Costs, Net of Unamortized Discounts

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- Definition

Disposal Group, Including Discontinued Operation, Long-term Debt, Including Current Maturities

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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.

+ References

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-Publisher FASB
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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