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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, 2023 | Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 471,170 |  | $ 465,706 |
Transfers out of Level III | (5,585) | [1] | (11,239) | [2]
Transfers into Level III | 6,519 | [3] | 9,432 | [4]
Net accretion | 2,745 |  | 4,916 |
Purchases | 8,948 |  | 53,926 |
Sales/Paydowns/Return of Capital | (35,203) |  | (40,828) |
Total realized gain (loss) included in earnings | (3,054) |  | (5,554) |
Change in unrealized gain (loss) included in earnings | (5,414) |  | 2,739 |
Ending balance | 440,126 |  | 479,098 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (8,033) |  | 3,737 |
Debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 410,144 |  | 392,432 |
Transfers out of Level III | (5,585) | [1] | (11,239) | [2]
Transfers into Level III | 6,519 | [3] | 9,432 | [4]
Net accretion | 2,197 |  | 3,282 |
Purchases | 8,880 |  | 53,926 |
Sales/Paydowns/Return of Capital | (29,317) |  | (38,627) |
Total realized gain (loss) included in earnings | (31) |  | (3,671) |
Change in unrealized gain (loss) included in earnings | (3,318) |  | 1,444 |
Ending balance | 389,489 |  | 406,979 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (6,986) |  | (2,752) |
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 21,905 |  | 20,992 |
Purchases | 68 |  |  |
Sales/Paydowns/Return of Capital | (5,429) |  | (2,257) |
Total realized gain (loss) included in earnings | 858 |  | 212 |
Change in unrealized gain (loss) included in earnings | (2,082) |  | 2,069 |
Ending balance | 15,320 |  | 21,016 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (1,032) |  | 2,216 |
CLO Fund Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 20,453 |  | 31,632 |
Net accretion | 548 |  | 1,634 |
Sales/Paydowns/Return of Capital | (457) |  | (2,032) |
Total realized gain (loss) included in earnings | (3,881) |  |  |
Change in unrealized gain (loss) included in earnings | 2,578 |  | (2,177) |
Ending balance | 19,241 |  | 29,057 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | 2,578 |  | (2,177) |
Joint Ventures |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 18,668 |  | 23,062 |
Change in unrealized gain (loss) included in earnings | (2,592) |  | (1,039) |
Ending balance | 16,076 |  | 22,023 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | $ (2,592) |  | (1,039) |
Derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance |  |  | (2,412) |
Sales/Paydowns/Return of Capital |  |  | 2,088 |
Total realized gain (loss) included in earnings |  |  | (2,095) |
Change in unrealized gain (loss) included in earnings |  |  | 2,442 |
Ending balance |  |  | 23 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  |  | $ 14 |
[1] | 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.
[2] | Transfers out of Level III represent a transfer of $11.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of March 31, 2022.
[3] | 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.
[4] | Transfers into Level III represent a transfer of $9.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of March 31, 2022.

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