Long-Term Debt - Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument
Carrying Value	$ 17,013,566	$ 17,070,789
Fair Value	16,347,251	17,568,043
Unamortized debt discount on the Convertible Notes	(903,094)	(925,360)
Unamortized deferred financing costs and debt	(44,324)	(46,782)
Capital Lease obligations	94,830	104,318
Total long-term debt and capital lease obligations (including current portion)	16,160,978	16,202,965
Principal balance reclassified to Current portion of long-term debt and capital lease obligations	969,000
4 1/4% Senior Notes due 2018
Debt Instrument
Carrying Value	969,388	1,025,861
Fair Value	$ 969,340	$ 1,031,596
Interest rate (as a percent)	4.25%	4.25%
Debt repurchased	$ 56,000
7 7/8% Senior Notes due 2019
Debt Instrument
Carrying Value	1,400,000	$ 1,400,000
Fair Value	$ 1,472,730	$ 1,501,206
Interest rate (as a percent)	7.875%	7.875%
5 1/8% Senior Notes due 2020
Debt Instrument
Carrying Value	$ 1,100,000	$ 1,100,000
Fair Value	$ 1,103,828	$ 1,127,588
Interest rate (as a percent)	5.125%	5.125%
6 3/4% Senior Notes due 2021
Debt Instrument
Carrying Value	$ 2,000,000	$ 2,000,000
Fair Value	$ 2,022,740	$ 2,120,480
Interest rate (as a percent)	6.75%	6.75%
5 7/8% Senior Notes due 2022
Debt Instrument
Carrying Value	$ 2,000,000	$ 2,000,000
Fair Value	$ 1,920,740	$ 2,014,140
Interest rate (as a percent)	5.875%	5.875%
5% Senior Notes due 2023
Debt Instrument
Carrying Value	$ 1,500,000	$ 1,500,000
Fair Value	$ 1,359,255	$ 1,432,335
Interest rate (as a percent)	5.00%	5.00%
5 7/8% Senior Notes due 2024
Debt Instrument
Carrying Value	$ 2,000,000	$ 2,000,000
Fair Value	$ 1,794,980	$ 1,952,220
Interest rate (as a percent)	5.875%	5.875%
2 3/8% Convertible Notes due 2024
Debt Instrument
Carrying Value	$ 1,000,000	$ 1,000,000
Fair Value	$ 885,570	962,860
Interest rate (as a percent)	2.375%
7 3/4% Senior Notes due 2026
Debt Instrument
Carrying Value	$ 2,000,000	2,000,000
Fair Value	$ 1,894,280	$ 2,118,400
Interest rate (as a percent)	7.75%	7.75%
3 3/8% Convertible Notes due 2026
Debt Instrument
Carrying Value	$ 3,000,000	$ 3,000,000
Fair Value	$ 2,879,610	$ 3,262,290
Interest rate (as a percent)	3.375%	3.375%
Other notes payable
Debt Instrument
Carrying Value	$ 44,178	$ 44,928
Fair Value	$ 44,178	$ 44,928

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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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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Fair value amount of debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt discount.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

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