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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 | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | $ 465,706 |  | $ 385,005 |  |
Transfers out of Level III |  | (14,172) | [1] | (10,936) | [2] |
Transfers into Level III |  | 3,815 | [3] | 21,522 | [4] |
Net accretion |  | 13,098 |  | 28,660 |  |
Purchases |  | 152,878 |  | 303,983 |  |
Sales/Paydowns/Return of Capital |  | (117,184) |  | (249,460) |  |
Total realized gain (loss) included in earnings |  | (31,363) |  | (6,051) |  |
Change in unrealized gain (loss) included in earnings |  | 1,608 |  | (7,017) |  |
Ending balance |  | 471,170 |  | 465,706 |  | $ 385,005
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | $ (18,595) |  | $ (4,597) |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Investment income |  | Investment income |  | Investment income
Debt securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | $ 392,432 |  | $ 334,245 |  |
Transfers out of Level III |  | (14,172) | [1] | (10,938) | [2] |
Transfers into Level III |  | 3,815 | [3] | 21,522 | [4] |
Net accretion |  | 9,054 |  | 23,906 |  |
Purchases |  | 146,017 |  | 274,406 |  |
Sales/Paydowns/Return of Capital |  | (108,369) |  | (232,167) |  |
Total realized gain (loss) included in earnings |  | (15,763) |  | 568 |  |
Change in unrealized gain (loss) included in earnings |  | 2,870 |  | (19,110) |  |
Ending balance |  | 410,144 |  | 392,432 |  | $ 334,245
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (15,256) |  | (8,356) |  |
Equity Securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | 20,992 |  | 12,537 |  |
Transfers out of Level III | [2] |  |  | (2) |  |
Purchases |  | 6,861 |  | 9,000 |  |
Sales/Paydowns/Return of Capital |  | (4,696) |  | (4,738) |  |
Total realized gain (loss) included in earnings |  | 1,257 |  | (2,176) |  |
Change in unrealized gain (loss) included in earnings |  | 2,509 |  | 6,367 |  |
Ending balance |  | 21,905 |  | 20,992 |  | 12,537
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | 2,250 |  | 3,355 |  |
CLO Fund Securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | 31,632 |  | 19,583 |  |
Net accretion |  | 4,044 |  | 4,754 |  |
Purchases |  |  |  | 18,077 |  |
Sales/Paydowns/Return of Capital |  | (6,194) |  | (11,675) |  |
Total realized gain (loss) included in earnings |  | (14,762) |  | (5,323) |  |
Change in unrealized gain (loss) included in earnings |  | 5,733 |  | 6,216 |  |
Ending balance |  | 20,453 |  | 31,632 |  | 19,583
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | 3,315 |  | 893 |  |
Joint Ventures |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | 23,062 |  | 19,749 |  |
Purchases |  |  |  | 2,500 |  |
Change in unrealized gain (loss) included in earnings |  | (4,394) |  | 813 |  |
Ending balance |  | 18,668 |  | 23,062 |  | 19,749
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (4,394) |  | 813 |  |
Derivatives |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning balance |  | (2,412) |  | (1,109) |  |
Sales/Paydowns/Return of Capital |  | 2,075 |  | (880) |  |
Total realized gain (loss) included in earnings |  | (2,095) |  | 880 |  |
Change in unrealized gain (loss) included in earnings |  | 2,432 |  | (1,303) |  |
Ending balance |  |  |  | (2,412) |  | $ (1,109)
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | $ (10) |  | $ (1,303) |  |
[1] | T ransfers out of Level III represent a transfer of $14.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of December 31, 2022.
[2] | Transfers out of Level III represent a transfer of $10.9 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of December 31, 2021.
[3] | Transfers into Level III represent a transfer of $3.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of December 31, 2022.
[4] | Transfers into Level III represent a transfer of $21.5 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of December 31, 2021.

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