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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 | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 471,170 |  | $ 465,706 |
Transfers out of Level III | (8,332) | [1] | (13,988) | [2]
Transfers into Level III | 6,369 | [3] | 5,351 | [4]
Net accretion | 6,690 |  | 11,286 |
Purchases | 30,613 |  | 157,237 |
Sales/Paydowns/Return of Capital | (87,335) |  | (127,966) |
Total realized gain (loss) included in earnings | (11,119) |  | (27,502) |
Change in unrealized gain (loss) included in earnings | (11,474) |  | 8,112 |
Ending balance | 396,582 |  | 478,236 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (14,759) |  | 8,838 |
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 | (8,332) | [1] | (13,988) | [2]
Transfers into Level III | 6,369 | [3] | 5,351 | [4]
Net accretion | 4,811 |  | 7,810 |
Purchases | 30,135 |  | 153,420 |
Sales/Paydowns/Return of Capital | (83,336) |  | (120,378) |
Total realized gain (loss) included in earnings | (800) |  | (14,624) |
Change in unrealized gain (loss) included in earnings | (7,203) |  | 2,222 |
Ending balance | 351,788 |  | 412,245 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (12,279) |  | (10,299) |
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 21,905 |  | 20,992 |
Purchases | 478 |  | 3,817 |
Sales/Paydowns/Return of Capital | (2,258) |  | (4,092) |
Total realized gain (loss) included in earnings | 2,599 |  | 1,271 |
Change in unrealized gain (loss) included in earnings | (3,535) |  | 1,182 |
Ending balance | 19,189 |  | 23,170 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (1,743) |  | 1,613 |
CLO Fund Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 20,453 |  | 31,632 |
Net accretion | 1,879 |  | 3,476 |
Sales/Paydowns/Return of Capital | (1,741) |  | (5,571) |
Total realized gain (loss) included in earnings | (12,918) |  | (12,054) |
Change in unrealized gain (loss) included in earnings | 2,752 |  | (7,140) |
Ending balance | 10,425 |  | 24,623 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | 2,752 |  | (4,722) |
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 | (3,488) |  | (4,872) |
Ending balance | 15,180 |  | 18,190 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | $ (3,488) |  | (4,872) |
Derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance |  |  | (2,412) |
Sales/Paydowns/Return of Capital |  |  | 2,075 |
Total realized gain (loss) included in earnings |  |  | (2,095) |
Change in unrealized gain (loss) included in earnings |  |  | 2,440 |
Ending balance |  |  | 8 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  |  | $ 2 |
[1] | Transfers out of Level III represent a transfer of $8.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2023.
[2] | Transfers out of Level III represent a transfer of $14.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[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 September 30, 2023.
[4] | Transfers into Level III represent a transfer of $5.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2022.

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