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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | $ 2,877,198 | $ 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 | $ 249,418 | 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 | $ 988,790 | 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 | $ 492,517 | 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 | $ 492,342 | 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 | $ 342,279 | 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 | $ 243,121 | 243,051
Carrying Amount | Secured debts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 68,731 | 69,713
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 2,707,221 | 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 | 238,401 | 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 | 1,056,375 | 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 | 462,823 | 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 | 428,303 | 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 | 253,540 | 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 | 198,400 | 226,500
Estimated Fair Value | Secured debts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | $ 69,379 | $ 71,963

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