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Debt Obligations - Senior Unsecured Notes (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2024 | May 31, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 30, 2024 | Apr. 30, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 6.86% | 7.67% |  |  |  |  |
Outstanding principal balance repaid |  |  |  | $ 26,600 | $ 43,100 |  |  |  |  |
9.00% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 9.00% |  |  |  |  |  |
Debt, face value |  |  |  | $ 100,000 | 0 |  |  |  |  |
Carrying value |  |  |  | $ 98,352 | $ 0 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 9.00% | 0.00% |  |  |  |  |
7.75% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 7.75% |  |  |  |  |  |
Debt, face value |  |  |  | $ 95,000 | $ 95,000 |  |  |  |  |
Carrying value |  |  |  | $ 94,275 | $ 93,697 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 7.75% | 7.75% |  |  |  |  |
8.50% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 8.50% |  | 8.50% |  |  |  |
Debt, face value |  |  |  | $ 150,000 | $ 150,000 | $ 150,000 |  |  |  |
Carrying value |  |  |  | $ 148,531 | $ 148,023 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 8.50% | 8.50% |  |  |  |  |
Proceeds from issued debt |  |  |  |  |  | $ 147,500 |  |  |  |
5.00% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.00% |  |  | 5.00% |  |  |
Debt, face value |  |  |  | $ 180,000 | $ 180,000 |  | $ 180,000 |  |  |
Carrying value |  |  |  | $ 178,300 | $ 177,875 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 5.00% | 5.00% |  |  |  |  |
Proceeds from issued debt |  |  |  |  |  |  | $ 177,200 |  |  |
4.50% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.50% |  |  | 4.50% | 4.50% |  |
Debt, face value |  |  |  | $ 270,000 | $ 270,000 |  | $ 270,000 | $ 275,000 |  |
Carrying value |  |  |  | $ 268,601 | $ 267,763 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 4.50% | 4.50% |  |  |  |  |
Proceeds from issued debt |  |  |  |  |  |  | $ 265,800 | $ 271,800 |  |
5.00% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.00% |  |  | 5.00% |  |  |
Debt, face value |  |  |  | $ 175,000 | $ 175,000 |  | $ 175,000 |  |  |
Carrying value |  |  |  | $ 174,161 | $ 173,542 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 5.00% | 5.00% |  |  |  |  |
Proceeds from issued debt |  |  |  |  |  |  | $ 172,300 |  |  |
4.50% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.50% |  |  |  |  |  |
Debt, face value |  |  |  | $ 275,000 | $ 275,000 |  |  |  |  |
Carrying value |  |  |  | $ 273,927 | $ 273,444 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 4.50% | 4.50% |  |  |  |  |
4.75% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.75% |  |  |  |  |  |
Debt, face value |  |  |  | $ 0 | $ 110,000 |  |  |  |  |
Carrying value |  |  |  | $ 0 | $ 109,721 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 0.00% | 4.75% |  |  |  |  |
Redemption of aggregate principal amount (as a percent) |  |  |  | 100.00% |  |  |  |  |  |
5.75% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.75% |  |  |  |  | 5.75% |
Debt, face value |  |  |  | $ 0 | $ 90,000 |  |  |  | $ 90,000 |
Carrying value |  |  |  | $ 0 | $ 89,903 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 0.00% | 5.75% |  |  |  |  |
Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, face value |  |  |  | $ 1,245,000 | $ 1,345,000 |  |  |  |  |
Carrying value |  |  |  | $ 1,236,147 | $ 1,333,968 |  |  |  |  |
Debt, Wtd. Avg. Rate |  |  |  | 5.73% | 5.41% |  |  |  |  |
Deferred financing fees |  |  |  | $ 8,900 | $ 11,000 |  |  |  |  |
Luxembourg Debt Fund |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  | 6.02% | 5.70% |  |  |  |  |
Senior Unsecured Notes 9.00 Percent | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 9.00% |  |  |  |  |  |  |  |  |
Debt, face value | $ 100,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 98,400 |  |  |  |  |  |  |  |  |
7.75% senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 7.75% |  |  |  |  |  |  |
Carrying value |  |  | $ 95,000 |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 8.00% |  |  |  |  |  |  |
Proceeds from issuance of unsecured notes |  |  | $ 93,400 |  |  |  |  |  |  |
Amount utilized from proceeds of issuance of unsecured note |  |  | $ 70,800 |  |  |  |  |  |  |
5.625% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.625% |  |  |  | 5.625% |  |  |  |
Proceeds from issuance of unsecured notes |  |  |  |  |  | $ 47,500 |  |  |  |
Proceeds from issued debt |  | $ 78,800 |  |  |  |  |  |  |  |
8.00% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 8.00%
Debt, face value |  |  |  |  |  |  |  |  |  | $ 70,800
4.75% Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 4.75% |  |  |  |  | 4.75% |  |  |  |
Debt, face value | $ 110,000 |  |  |  |  | $ 66,100 |  |  |  |

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