Long-Term Debt and Finance Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt and Capital Lease Obligations
Carrying amount	$ 2,387,127	$ 2,387,127	$ 3,304,079
Finance lease obligations	208,907	208,907
Finance lease obligations			228,702
Total debt and finance lease obligations	2,596,034	2,596,034	3,532,781
Less: Current portion	(42,682)	(42,682)	(959,577)
Long-term debt and finance lease obligations, net	2,553,352	2,553,352	2,573,204
Fair Value	$ 2,536,598	$ 2,536,598	$ 3,259,816
6 1/2% Senior Secured Notes due 2019
Debt and Capital Lease Obligations
Interest rate	6.50%	6.50%	6.50%
Effective Interest Rate	6.959%	6.959%
Carrying Amount	$ 0	$ 0	$ 920,836
Fair Value	0	0	932,696
Repurchased debt	$ 4,000	$ 12,000
5 1/4% Senior Secured Notes due 2026
Debt and Capital Lease Obligations
Interest rate	5.25%	5.25%
Effective Interest Rate	5.32%	5.32%
Carrying Amount	$ 750,000	$ 750,000	750,000
Fair Value	$ 774,375	$ 774,375	695,865
7 5/8% Senior Unsecured Notes due 2021
Debt and Capital Lease Obligations
Interest rate	7.625%	7.625%
Effective Interest Rate	8.062%	8.062%
Carrying Amount	$ 900,000	$ 900,000	900,000
Fair Value	$ 970,515	$ 970,515	934,902
6 5/8% Senior Unsecured Notes due 2026
Debt and Capital Lease Obligations
Interest rate	6.625%	6.625%
Effective Interest Rate	6.688%	6.688%
Carrying Amount	$ 750,000	$ 750,000	750,000
Fair Value	791,708	791,708	696,353
Less: Unamortized debt issuance costs
Debt and Capital Lease Obligations
Less: Unamortized debt issuance costs	$ (12,873)	$ (12,873)	$ (16,757)

Payments For Repurchase Of Debt

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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.

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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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 classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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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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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Amount of long-term debt and lease obligation, including portion classified as current.

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