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Debt Obligations - Senior Unsecured Notes (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
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Oct. 31, 2022 | Aug. 31, 2021 | Oct. 31, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Obligations |  |  |  |  |  |  |  |
Redemption of aggregate principal amount (as a percent) |  |  |  | 100.00% |  |  |  |
Senior notes carrying value |  |  |  | $ 1,385,994 | $ 1,280,545 |  |  |
5.00% Convertible notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) | $ 150,000 |  |  | $ 180,000 | $ 180,000 |  |  |
Interest rate (as a percent) | 8.50% |  |  | 5.00% | 5.00% |  |  |
Proceeds from issued debt | $ 147,500 |  |  |  | $ 177,200 |  |  |
4.50% Convertible Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  | $ 270,000 |  | $ 270,000 | 270,000 | $ 275,000 |  |
Interest rate (as a percent) |  | 4.50% |  | 4.50% |  | 4.50% |  |
Proceeds from issued debt |  | $ 265,800 |  |  |  | $ 271,800 |  |
5.00% Convertible Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 175,000 | $ 175,000 |  |  |
Interest rate (as a percent) |  |  |  | 5.00% | 5.00% |  |  |
Proceeds from issued debt |  |  |  |  | $ 172,300 |  |  |
5.625% Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 78,850 | 125,000 |  |  | $ 125,000
Interest rate (as a percent) | 5.625% |  |  | 5.625% |  |  |  | 5.625%
Proceeds from issued debt |  |  |  |  |  |  |  | $ 122,300
4.75% Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 110,000 | 110,000 |  |  |
Interest rate (as a percent) |  |  |  | 4.75% |  |  |  |
Redemption of aggregate principal amount (as a percent) |  |  | 100.00% | 100.00% |  |  |  |
5.75% Convertible Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 90,000 | 90,000 |  | $ 90,000 |
Interest rate (as a percent) |  |  |  | 5.75% |  |  | 5.75% |
Proceeds from issued debt |  |  |  |  |  |  | $ 88,200 |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 1,399,600 | 1,295,750 |  |  |
8.00% Convertible Notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt, Face Value (UPB) |  |  |  | $ 70,750 | $ 70,750 | $ 70,800 |  |
Interest rate (as a percent) |  |  |  | 8.00% |  | 8.00% |  |
Proceeds from issued debt |  |  |  |  |  | $ 69,600 |  |

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