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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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-Name Accounting Standards Codification
-Topic 210
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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
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No definition available.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Oct. 31, 2020	Jan. 31, 2020	Dec. 31, 2019	Oct. 11, 2018	Jan. 31, 2017
Fair Value of Financial Instruments
Less: deferred financing costs	$ 22,270			$ 30,332
Long-term debt	$ 2,968,701			$ 3,333,220
5.00% senior notes due September 2020
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.00%
Effective Interest Rate (as a percent)				5.44%
4.625% senior notes due September 2021
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	4.625%
Effective Interest Rate (as a percent)	5.65%			4.76%
5.50% senior notes due January 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.50%
Effective Interest Rate (as a percent)	5.85%			5.90%
5.10% senior notes due September 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.10%
Effective Interest Rate (as a percent)	5.32%			5.24%
0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	0.75%					0.75%
Effective Interest Rate (as a percent)	6.06%			5.97%
5.75% senior notes due February 2025
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.75%
Effective Interest Rate (as a percent)	6.01%			6.01%
6.50% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	6.50%	6.50%
Effective Interest Rate (as a percent)	6.50%
9.00% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	9.00%	9.00%
Effective Interest Rate (as a percent)	9.00%
7.25% senior notes due January 2026
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	7.25%		7.25%
Effective Interest Rate (as a percent)	7.51%
7.50% senior notes due January 2028
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	7.50%		7.50%
Effective Interest Rate (as a percent)	7.69%
2012 revolving credit facility
Fair Value of Financial Instruments
Effective Interest Rate (as a percent)				3.71%
2018 revolving credit facility
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)					5.50%
Effective Interest Rate (as a percent)	3.53%
Fair Value
Fair Value of Financial Instruments
Debt	$ 2,229,649			$ 3,196,660
Fair Value \| 5.00% senior notes due September 2020
Fair Value of Financial Instruments
Debt				284,907
Fair Value \| 4.625% senior notes due September 2021
Fair Value of Financial Instruments
Debt	78,862			632,516
Fair Value \| 5.50% senior notes due January 2023
Fair Value of Financial Instruments
Debt	18,768			483,834
Fair Value \| 5.10% senior notes due September 2023
Fair Value of Financial Instruments
Debt	78,435			303,860
Fair Value \| 0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Debt	169,458			431,503
Fair Value \| 5.75% senior notes due February 2025
Fair Value of Financial Instruments
Debt	318,871			705,040
Fair Value \| 6.50% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Debt	44,059
Fair Value \| 9.00% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Debt	185,221
Fair Value \| 7.25% senior notes due January 2026
Fair Value of Financial Instruments
Debt	396,106
Fair Value \| 7.50% senior notes due January 2028
Fair Value of Financial Instruments
Debt	267,369
Fair Value \| 2012 revolving credit facility
Fair Value of Financial Instruments
Debt				355,000
Fair Value \| 2018 revolving credit facility
Fair Value of Financial Instruments
Debt	672,500
Carrying Value
Fair Value of Financial Instruments
Debt	2,990,971			3,363,552
Less: deferred financing costs	22,270			30,332
Long-term debt	2,968,701			3,333,220
Carrying Value \| 5.00% senior notes due September 2020
Fair Value of Financial Instruments
Debt				282,046
Carrying Value \| 4.625% senior notes due September 2021
Fair Value of Financial Instruments
Debt	86,329			634,588
Carrying Value \| 5.50% senior notes due January 2023
Fair Value of Financial Instruments
Debt	28,443			501,003
Carrying Value \| 5.10% senior notes due September 2023
Fair Value of Financial Instruments
Debt	121,077			336,810
Carrying Value \| 0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Debt	279,700			472,603
Carrying Value \| 5.75% senior notes due February 2025
Fair Value of Financial Instruments
Debt	610,818			781,502
Carrying Value \| 6.50% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Debt	50,485
Carrying Value \| 9.00% senior priority guaranteed notes due February 2025
Fair Value of Financial Instruments
Debt	192,032
Carrying Value \| 7.25% senior notes due January 2026
Fair Value of Financial Instruments
Debt	559,978
Carrying Value \| 7.50% senior notes due January 2028
Fair Value of Financial Instruments
Debt	389,609
Carrying Value \| 2012 revolving credit facility
Fair Value of Financial Instruments
Debt				$ 355,000
Carrying Value \| 2018 revolving credit facility
Fair Value of Financial Instruments
Debt	$ 672,500