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

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Debt - Estimated Fair Value of Long-Term Debt (Details) - USD ($)	Sep. 30, 2021	Feb. 05, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 406,000,000	$ 393,500,000	$ 0
Carrying Value
Debt Instrument [Line Items]
Total debt	406,000,000		3,977,926,000
Current maturities of long-term debt	0		0
Long-term debt	406,000,000		0
Estimated Fair Value
Debt Instrument [Line Items]
Total debt	429,071,000		898,938,000
Current maturities of long-term debt	0		0
Long-term debt	429,071,000		0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts or premiums	11,100,000
Line of Credit \| Carrying Value \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	190,000,000		0
Line of Credit \| Estimated Fair Value \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	$ 190,000,000		0
11.000% Second Lien Notes due February 2028 \| Secured notes
Debt Instrument [Line Items]
Interest rate, stated percentage	11.00%
Total debt		$ 216,000,000
Unamortized debt issuance costs and discounts or premiums	$ 0
11.000% Second Lien Notes due February 2028 \| Secured notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	216,000,000		0
11.000% Second Lien Notes due February 2028 \| Secured notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 239,071,000		0
4.900% Senior Notes due August 2020 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.90%	4.90%
4.900% Senior Notes due August 2020 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		62,535,000
4.900% Senior Notes due August 2020 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		1,366,000
4.625% Senior Notes due March 2021 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.625%	4.625%
4.625% Senior Notes due March 2021 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		79,936,000
4.625% Senior Notes due March 2021 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		1,596,000
3.950% Senior Notes due March 2022 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.95%	3.95%
3.950% Senior Notes due March 2022 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		21,213,000
3.950% Senior Notes due March 2022 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		354,000
7.750% Senior Notes due January 2024 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	7.75%	7.75%
7.750% Senior Notes due January 2024 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		397,025,000
7.750% Senior Notes due January 2024 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		7,925,000
7.950% Senior Notes due April 2025 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	7.95%	7.95%
7.950% Senior Notes due April 2025 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		450,000,000
7.950% Senior Notes due April 2025 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		8,348,000
7.875% Senior Notes due February 2026 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	7.875%	7.875%
7.875% Senior Notes due February 2026 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		750,000,000
7.875% Senior Notes due February 2026 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		301,935,000
6.200% Senior Notes due August 2040 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.20%	6.20%
6.200% Senior Notes due August 2040 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		393,596,000
6.200% Senior Notes due August 2040 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		7,966,000
6.050% Senior Notes due March 2041 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.05%	6.05%
6.050% Senior Notes due March 2041 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		395,002,000
6.050% Senior Notes due March 2041 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		7,327,000
5.250% Senior Notes due March 2042 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%	5.25%
5.250% Senior Notes due March 2042 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		483,619,000
5.250% Senior Notes due March 2042 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		9,701,000
8.950% Senior Notes due April 2045 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	8.95%	8.95%
8.950% Senior Notes due April 2045 \| Senior Unsecured Notes \| Carrying Value
Debt Instrument [Line Items]
Total debt	$ 0		400,000,000
8.950% Senior Notes due April 2045 \| Senior Unsecured Notes \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	0		7,420,000
The 2017 Credit Facility \| Line of Credit \| Carrying Value
Debt Instrument [Line Items]
Total debt	0		545,000,000
The 2017 Credit Facility \| Line of Credit \| Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0		$ 545,000,000