Long-Term Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt and Capital Lease Obligations
Fair Value	$ 3,453,414	$ 3,596,524
Carrying amount	3,371,053	3,365,143
Capital lease obligations	241,854	269,701
Total debt and capital lease obligations	3,612,907	3,634,844
Less: Current portion	(1,030,088)	(40,631)
Long-term debt and capital lease obligations, net	$ 2,582,819	$ 3,594,213
6 1/2% Senior Secured Notes due 2019
Debt and Capital Lease Obligations
Interest rate	6.50%	6.50%
Effective Interest Rate	6.959%
Carrying Amount	$ 990,000	$ 990,000
Fair Value	$ 1,011,958	$ 1,042,609
5 1/4% Senior Secured Notes due 2026
Debt and Capital Lease Obligations
Interest rate	5.25%	5.25%
Effective Interest Rate	5.32%
Carrying Amount	$ 750,000	$ 750,000
Fair Value	$ 736,590	$ 769,305
7 5/8% Senior Unsecured Notes due 2021
Debt and Capital Lease Obligations
Interest rate	7.625%	7.625%
Effective Interest Rate	8.062%
Carrying Amount	$ 900,000	$ 900,000
Fair Value	$ 974,088	$ 992,745
6 5/8% Senior Unsecured Notes due 2026
Debt and Capital Lease Obligations
Interest rate	6.625%	6.625%
Effective Interest Rate	6.688%
Carrying Amount	$ 750,000	$ 750,000
Fair Value	730,778	791,865
Unamortized debt issuance costs
Debt and Capital Lease Obligations
Less: Unamortized debt issuance costs	$ (18,947)	$ (24,857)

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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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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