Debt - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital lease obligations and sale-leaseback financings	$ 108,691	$ 139,758
Total long-term debt	2,701,184	3,200,565
Less: total unamortized deferred financing costs	91,184	105,299
Less: current portion of long-term debt	104,502	121,870
Long-term debt, less current portion	2,505,498	2,973,396
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	52,226	42,195
Notes payable and other debt
Debt Instrument [Line Items]
Total senior and other debt	512,537	593,268
Senior and Other Debt
Debt Instrument [Line Items]
Total senior and other debt	2,592,493	3,060,807
Senior Long-term Debt
Debt Instrument [Line Items]
Total senior and other debt	2,027,730	2,425,344
Secured Credit Facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Total senior and other debt	$ 1,227,730	$ 1,625,344

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

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- Definition

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.

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- Definition

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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