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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	$ 2,372,292	$ 2,876,524
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	4.75%
Fair value disclosure	$ 249,488	249,348
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 9.750% coupon rate, due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	9.75%
Fair value disclosure	$ 494,838	987,903
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	4.75%
Fair value disclosure	$ 492,836	492,199
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.375% coupon rate, due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	4.375%
Fair value disclosure	$ 492,557	492,127
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 5.625% coupon rate, due 2042
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	5.625%
Fair value disclosure	$ 342,374	342,183
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 6.250% coupon rate, due 2046
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon rate (percent)	6.25%
Fair value disclosure	$ 243,193	243,051
Carrying Amount | Secured Debts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	57,006	69,713
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	1,880,314	2,919,651
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	224,353	257,695
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 9.750% coupon rate, due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	493,125	1,081,990
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	368,125	491,480
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.375% coupon rate, due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	340,000	480,763
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 5.625% coupon rate, due 2042
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	227,850	309,260
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 6.250% coupon rate, due 2046
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	170,700	226,500
Estimated Fair Value | Secured Debts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value disclosure	$ 56,161	$ 71,963

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