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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 357,528 |  | $ 471,170 |
Transfers out of Level III | (9,239) | [1] | (5,585) | [2]
Transfers into Level III | 6,433 | [3] | 6,519 | [4]
Net accretion | 1,000 |  | 2,745 |
Purchases | 37,174 |  | 8,948 |
Sales/Paydowns/Return of Capital | (24,429) |  | (35,203) |
Total realized gain (loss) included in earnings | (1,662) |  | (3,054) |
Change in unrealized gain (loss) included in earnings | (1,152) |  | (5,414) |
Ending balance | 365,653 |  | 440,126 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (1,152) |  | (8,033) |
Debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 313,752 |  | 410,144 |
Transfers out of Level III | (9,239) | [1] | (5,585) | [2]
Transfers into Level III | 6,433 | [3] | 6,519 | [4]
Net accretion | 444 |  | 2,197 |
Purchases | 34,377 |  | 8,880 |
Sales/Paydowns/Return of Capital | (22,566) |  | (29,317) |
Total realized gain (loss) included in earnings | (1,660) |  | (31) |
Change in unrealized gain (loss) included in earnings | (1,388) |  | (3,318) |
Ending balance | 320,153 |  | 389,489 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (1,388) |  | (6,986) |
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 20,533 |  | 21,905 |
Purchases | 2,797 |  | 68 |
Sales/Paydowns/Return of Capital | (503) |  | (5,429) |
Total realized gain (loss) included in earnings | 503 |  | 858 |
Change in unrealized gain (loss) included in earnings | 98 |  | (2,082) |
Ending balance | 23,428 |  | 15,320 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | 98 |  | (1,032) |
CLO Fund Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 8,968 |  | 20,453 |
Net accretion | 556 |  | 548 |
Purchases | 0 |  |  |
Sales/Paydowns/Return of Capital | (392) |  | (457) |
Total realized gain (loss) included in earnings | (505) |  | (3,881) |
Change in unrealized gain (loss) included in earnings | (78) |  | 2,578 |
Ending balance | 8,549 |  | 19,241 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (78) |  | 2,578 |
Joint Ventures |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 14,275 |  | 18,668 |
Sales/Paydowns/Return of Capital | (968) |  |  |
Change in unrealized gain (loss) included in earnings | 216 |  | (2,592) |
Ending balance | 13,523 |  | 16,076 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | $ 216 |  | $ (2,592) |
[1] | Transfers out of Level III represent a transfer of $9.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of March 31, 2024.
[2] | Transfers out of Level III represent a transfer of $5.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of March 31, 2023.
[3] | Transfers into Level III represent a transfer of $6.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of March 31, 2024.
[4] | Transfers into Level III represent a transfer of $6.5 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of March 31, 2023.

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