Indebtedness (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt and Capital Lease Obligations [Line Items]
Current obligations	$ 88,503	$ 88,370
Current deferred financing fees and debt discount	(4,718)	(4,811)
Current portion of long-term debt and financing lease obligation	83,785	83,559
Lease finance obligation	2,068,533	2,134,932
Noncurrent deferred financing fees and debt discount	(15,160)	(18,688)
Long-term debt and financing lease obligation, net of current portion	2,053,373	2,116,244
Total	2,137,158	2,199,803
Term Loan A
Debt and Capital Lease Obligations [Line Items]
Current obligations	19,550	19,550
Noncurrent obligations	351,900	366,562
Term Loan A-1 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	62,500	62,500
Noncurrent obligations	1,125,000	1,171,875
Term Loan B3 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	5,450	5,450
Noncurrent obligations	531,375	535,463
Lease Finance obligation
Debt and Capital Lease Obligations [Line Items]
Current obligations	1,003	870
Noncurrent obligations	$ 60,258	$ 61,032

Debt and Capital Lease Obligations [Line Items]

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Deferred finance cost and debt discount current.

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Deferred Finance Cost and Debt Discount Noncurrent

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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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 more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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