Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Gain (Loss) on Securities [Line Items] | ||
| Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ (38,270) | $ 21,179 |
| Securities | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gain/(loss) on other portfolio investments | (38,871) | 20,201 |
| Net realized gain/(loss) on other portfolio investments | 0 | 234 |
| Impairment of securities | 0 | 0 |
| Total Impairment and other net gain/(loss) on securities and other portfolio investments | (38,871) | 20,435 |
| Other Portfolio Investments | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gain/(loss) on other portfolio investments | 3,427 | 753 |
| Net realized gain/(loss) on other portfolio investments | (2,826) | (9) |
| Reversal of impairment/(impairment) other portfolio investments | $ 0 | $ 0 |