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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	$ 2,876,524	$ 3,299,762
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	$ 2,919,651	3,489,902
Senior unsecured notes | Senior unsecured notes, 6.750% coupon rate, due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	6.75%
Senior unsecured notes | Senior unsecured notes, 4.750% coupon rate, due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.75%
Senior unsecured notes | Senior unsecured notes, 9.750% coupon rate, due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	9.75%
Senior unsecured notes | Senior unsecured notes, 4.750% coupon rate, due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.75%
Senior unsecured notes | Senior unsecured notes, 4.375% coupon rate, due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.375%
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 6.750% coupon rate, due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	6.75%
Secured and secured debt	$ 0	299,273
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 4.750% coupon rate, due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.75%
Secured and secured debt	$ 249,348	249,068
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 9.750% coupon rate, due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	9.75%
Secured and secured debt	$ 987,903	984,359
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 4.750% coupon rate, due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.75%
Secured and secured debt	$ 492,199	490,925
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 4.375% coupon rate, due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	4.375%
Secured and secured debt	$ 492,127	0
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 5.625% coupon rate, due 2042
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	5.625%
Secured and secured debt	$ 342,183	341,802
Senior unsecured notes | Carrying Amount | Senior unsecured notes, 6.250% coupon rate, due 2046
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Coupon	6.25%
Secured and secured debt	$ 243,051	242,762
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 6.750% coupon rate, due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	0	303,891
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 4.750% coupon rate, due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	257,695	256,258
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 9.750% coupon rate, due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	1,081,990	1,135,800
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 4.750% coupon rate, due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	491,480	502,648
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 4.375% coupon rate, due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	480,763	0
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 5.625% coupon rate, due 2042
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	309,260	330,120
Senior unsecured notes | Estimated Fair Value | Senior unsecured notes, 6.250% coupon rate, due 2046
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	226,500	245,000
Secured debts | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	69,713	691,573
Secured debts | Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Secured and secured debt	$ 71,963	$ 716,185

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