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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Nov. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2022
--- | --- | --- | --- | --- | ---
Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 2,910,904 |  |  | $ 2,816,849 |
Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | 2,564,449 |  |  | 2,399,525 |
Secured Debts and Finance Leases | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | 126,611 |  |  | 13,020 |
Secured Debts and Finance Leases | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 126,001 |  |  | 12,284 |
Senior unsecured notes, 9.750% coupon rate, due 2025 | Senior Unsecured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 9.75% | 9.75% | 9.75% |  | 9.75%
Senior unsecured notes, 9.750% coupon rate, due 2025 | Senior Unsecured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 379,392 |  |  | 497,454 |
Senior unsecured notes, 9.750% coupon rate, due 2025 | Senior Unsecured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 379,970 |  |  | 490,750 |
Senior secured notes, zero coupon rate, due 2026 | Senior Secured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 0.00% |  |  |  |
Senior secured notes, zero coupon rate, due 2026 | Senior Secured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 826,974 |  |  | 731,211 |
Senior secured notes, zero coupon rate, due 2026 | Senior Secured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 885,108 |  |  | 771,981 |
Senior unsecured notes, 4.750% coupon rate, due 2028 | Senior Unsecured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 4.75% |  |  |  |
Senior unsecured notes, 4.750% coupon rate, due 2028 | Senior Unsecured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 496,018 |  |  | 494,746 |
Senior unsecured notes, 4.750% coupon rate, due 2028 | Senior Unsecured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 429,170 |  |  | 384,110 |
Senior unsecured notes, 4.375% coupon rate, due 2031 | Senior Unsecured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 4.375% |  |  |  |
Senior unsecured notes, 4.375% coupon rate, due 2031 | Senior Unsecured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 494,702 |  |  | 493,845 |
Senior unsecured notes, 4.375% coupon rate, due 2031 | Senior Unsecured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 368,240 |  |  | 375,000 |
Senior unsecured notes, 5.625% coupon rate, due 2042 | Senior Unsecured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 5.625% |  |  |  |
Senior unsecured notes, 5.625% coupon rate, due 2042 | Senior Unsecured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 343,302 |  |  | 342,946 |
Senior unsecured notes, 5.625% coupon rate, due 2042 | Senior Unsecured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 218,260 |  |  | 211,400 |
Senior unsecured notes, 6.250% coupon rate, due 2046 | Senior Unsecured Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Coupon rate | 6.25% |  |  |  |
Senior unsecured notes, 6.250% coupon rate, due 2046 | Senior Unsecured Notes | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 243,905 |  |  | 243,627 |
Senior unsecured notes, 6.250% coupon rate, due 2046 | Senior Unsecured Notes | Estimated Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Fair value disclosure | $ 157,700 |  |  | $ 154,000 |

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