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Debt Obligations - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) $ / shares | Mar. 31, 2024 USD ($) extension | Jan. 31, 2024 USD ($) facility | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2024 USD ($) | Apr. 30, 2024 USD ($) | Feb. 29, 2024 USD ($)
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, number of facilities consolidated | facility |  |  |  | 2 |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 5,000,000.0 |  |  | $ 5,000,000.0 |  | $ 5,000,000.0 |  |  |  |  |
Junior subordinated notes to subsidiary trust issuing preferred securities |  | $ 144,275,000 |  |  | $ 144,275,000 |  | $ 144,275,000 |  | $ 143,896,000 |  |  |
Debt, Wtd. Avg. Rate |  | 7.83% |  |  | 7.83% |  | 7.83% |  |  |  |  |
CLO 14, 16 and 19 |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Debt paid down |  |  |  |  |  |  | $ 518,600,000 |  |  |  |  |
Q Series securitization |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage |  | 8.04% |  |  | 8.04% |  | 8.04% |  | 7.99% |  |  |
Debt paid down |  |  |  |  |  |  | $ 31,800,000 |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 7.33% |  |  | 7.33% |  | 7.33% |  | 7.38% |  |  |
Convertible senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Percentage of notes required to be repurchased if the agreement is fundamentally changed |  |  |  |  |  |  | 100.00% |  |  |  |  |
Interest expense |  |  |  |  | $ 6,100,000 | $ 6,100,000 | $ 12,200,000 | $ 12,200,000 |  |  |  |
Interest expense related to cash coupon |  |  |  |  | 5,400,000 | 5,400,000 | 10,800,000 | 10,800,000 |  |  |  |
Deferred fees expensed as interest expense |  |  |  |  | $ 700,000 | $ 700,000 | $ 1,400,000 | $ 1,400,000 |  |  |  |
Weighted average cost of notes, percentage |  | 8.43% |  |  | 8.43% |  | 8.43% |  | 8.42% |  |  |
7.50% convertible notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 7.50% |  |  | 7.50% |  | 7.50% |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes | 0.0607378 |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of common stock (in dollars per share) | $ / shares |  | $ 16.46 |  |  | $ 16.46 |  | $ 16.46 |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage |  | 8.30% |  |  | 8.30% |  | 8.30% |  | 8.56% |  |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  | $ 1,400,000 |  | $ 1,500,000 |  |  |
Junior subordinated notes to subsidiary trust issuing preferred securities |  | $ 144,300,000 |  |  | $ 144,300,000 |  | 144,300,000 |  | 143,900,000 |  |  |
Deferred amount due at maturity |  | $ 8,600,000 |  |  | $ 8,600,000 |  | $ 8,600,000 |  | $ 9,000,000.0 |  |  |
Debt, Wtd. Avg. Rate |  | 8.21% |  |  | 8.21% |  | 8.21% |  | 8.48% |  |  |
Amount payable on default of senior debt |  | $ 0 |  |  | $ 0 |  | $ 0 |  |  |  |  |
Structured Business |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage |  | 8.40% |  |  | 8.40% |  | 8.40% |  | 8.26% |  |  |
Leverage on loans and investment portfolio financed through credit and repurchase facilities, excluding securities repurchase facility and working capital facility |  | 67.00% |  |  | 67.00% |  | 67.00% |  | 69.00% |  |  |
Debt, Wtd. Avg. Rate |  | 7.96% |  |  | 7.96% |  | 7.96% |  |  |  |  |
Structured Business | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Weighted average loan spread |  |  |  | 0.0550 |  |  |  |  |  |  |  |
Structured Business | $650M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 650,000,000.0 |  |  | $ 650,000,000.0 |  | $ 650,000,000.0 |  |  |  |  |
SOFR floor, percentage |  | 0.25% |  |  |  |  |  |  |  |  |  |
Structured Business | $650M repurchase facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  | 2.61% |  |  |  |  |  |  |  |  |  |
Structured Business | $650M repurchase facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  | 3.11% |  |  |  |  |  |  |  |  |  |
Structured Business | $200M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 200,000,000.0 |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |
Structured Business | $100M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000,000 |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  | $ 100,000,000.0 |
Debt, Wtd. Avg. Rate |  | 7.13% |  |  | 7.13% |  | 7.13% |  |  |  |  |
Structured Business | $500M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Structured Business | $1B repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 1,000,000,000.00 | $ 1,000,000,000 | 1,000,000,000.00 |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 8.29% |  |  | 8.29% |  | 8.29% |  |  |  |  |
Structured Business | $450M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000.0
Structured Business | $350M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 350,000,000.0 | $ 350,000,000 | $ 350,000,000.0 |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |
Maturity extensions exercised | extension |  |  | 1 |  |  |  |  |  |  |  |  |
Number of extension options | extension |  |  | 2 |  |  |  |  |  |  |  |  |
Length of extension option | 1 year |  | 1 year |  |  |  |  |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 7.53% |  |  | 7.53% |  | 7.53% |  |  |  |  |
Structured Business | $250M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000.0 | $ 250,000,000 | $ 250,000,000.0 |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Variable rate, spread |  |  | 3.25% |  |  |  |  |  |  |  |  |
SOFR floor, percentage |  |  | 2.50% |  |  |  |  |  |  |  |  |
Length of extension option | 1 year |  | 1 year |  |  |  |  |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 8.70% |  |  | 8.70% |  | 8.70% |  |  |  |  |
Structured Business | $225M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 225,000,000.0 |  |  |
Structured Business | $25M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |
Structured Business | $150M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 3.00% |  |  |  |  |  |  |  |
Agency Business |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 70,000,000.0 |  |  | $ 70,000,000.0 |  | $ 70,000,000.0 |  |  | $ 64,000,000.0 |  |
Debt, Wtd. Avg. Rate |  | 6.76% |  |  | 6.76% |  | 6.76% |  |  |  |  |
Agency Business | $200M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 6.73% |  |  | 6.73% |  | 6.73% |  |  |  |  |
Agency Business | $100M credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000,000 |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 6.79% |  |  | 6.79% |  | 6.79% |  |  |  |  |
Agency Business | $500M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 500,000,000.0 |  |  | $ 500,000,000.0 |  | $ 500,000,000.0 |  |  |  |  |
Debt, Wtd. Avg. Rate |  | 6.82% |  |  | 6.82% |  | 6.82% |  |  |  |  |

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