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Debt Obligations - Senior Unsecured Notes, Summary (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2021 | Aug. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Debt Obligations |  |  |  |  |  |  |  |  |
Wtd. Avg Rate |  | 2.21% |  |  | 2.20% |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 1,295,750 |  |  | $ 670,750 |  |  |  |
Carrying value |  | $ 1,280,545 |  |  | $ 662,843 |  |  |  |
Wtd. Avg Rate |  | 5.05% |  |  | 5.29% |  |  |  |
Deferred financing fees |  | $ 15,200 |  |  | $ 7,900 |  |  |  |
5.00% Convertible notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | 180,000 |  |  |  |  |  |  |
Carrying value |  | $ 177,105 |  |  |  |  |  |  |
Wtd. Avg Rate |  | 5.00% |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.00% |  |  |  |  |  |  |
5.00% Convertible Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 175,000 |  | $ 175,000 |  |  |  |  |
Carrying value |  | $ 172,302 |  |  |  |  |  |  |
Wtd. Avg Rate |  | 5.00% |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.00% |  | 5.00% |  |  |  |  |
8.00% Convertible Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 70,750 |  |  | 70,750 | $ 40,500 |  |  |
Carrying value |  | $ 70,202 |  |  | $ 69,793 |  |  |  |
Wtd. Avg Rate |  | 8.00% |  |  | 8.00% |  |  |  |
Interest rate (as a percent) |  | 8.00% |  |  |  | 8.00% |  |  |
4.50% Convertible Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 275,000 | $ 270,000 |  | $ 275,000 |  | $ 275,000 |  |
Carrying value |  | $ 272,477 |  |  | $ 271,994 |  |  |  |
Wtd. Avg Rate |  | 4.50% |  |  | 4.50% |  |  |  |
Interest rate (as a percent) |  | 4.50% | 4.50% |  |  |  | 4.50% |  |
4.50% Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 270,000 |  |  |  |  |  |  |
Carrying value |  | $ 266,090 |  |  |  |  |  |  |
Wtd. Avg Rate |  | 4.50% |  |  |  |  |  |  |
4.75% Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 110,000 |  |  | $ 110,000 |  |  |  |
Carrying value |  | $ 109,018 |  |  | $ 108,668 |  |  |  |
Wtd. Avg Rate |  | 4.75% |  |  | 4.75% |  |  |  |
Redemption of aggregate principal amount (as a percent) | 100.00% | 100.00% |  |  |  |  |  |  |
5.75% Convertible Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 90,000 |  |  | $ 90,000 |  |  | $ 90,000 |
Carrying value |  | $ 89,135 |  |  | $ 88,751 |  |  |  |
Wtd. Avg Rate |  | 5.75% |  |  | 5.75% |  |  |  |
Interest rate (as a percent) |  | 5.75% |  |  |  |  |  | 5.75% |
5.625% Notes |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 125,000 |  |  | $ 125,000 |  |  |  | $ 100,000
Carrying value |  | $ 124,216 |  |  | $ 123,637 |  |  |  |
Wtd. Avg Rate |  | 5.63% |  |  | 5.63% |  |  |  |
Interest rate (as a percent) |  | 5.625% |  |  |  |  |  |  | 5.625%
Collateralized debt obligations |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
UPB |  | $ 5,924,705 |  |  | $ 2,532,343 |  |  |  |

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