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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, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 465,706 |  | $ 385,005 |
Transfers out of Level III | (13,988) | [1] | (13,819) | [2]
Transfers into Level III | 5,351 | [3] | 20,127 | [4]
Net accretion | 11,286 |  | 23,180 |
Purchases | 157,237 |  | 455,251 |
Sales/Paydowns/Return of Capital | (127,966) |  | (420,991) |
Total realized gain (loss) included in earnings | (27,502) |  | (11,478) |
Change in unrealized gain (loss) included in earnings | 8,112 |  | 5,879 |
Ending balance | 478,236 |  | 443,154 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (8,838) |  | 16,701 |
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 | (13,988) | [1] | (13,819) | [2]
Transfers into Level III | 5,351 | [3] | 20,127 | [4]
Net accretion | 7,810 |  | 23,180 |
Purchases | 153,420 |  | 443,996 |
Sales/Paydowns/Return of Capital | (120,378) |  | (409,189) |
Total realized gain (loss) included in earnings | (14,624) |  | (7,209) |
Change in unrealized gain (loss) included in earnings | 2,222 |  | (8,067) |
Ending balance | 412,245 |  | 383,264 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (10,299) |  | 7,905 |
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 20,992 |  | 12,537 |
Purchases | 3,817 |  | 8,755 |
Sales/Paydowns/Return of Capital | (4,092) |  | (4,481) |
Total realized gain (loss) included in earnings | 1,271 |  | 174 |
Change in unrealized gain (loss) included in earnings | 1,182 |  | 3,767 |
Ending balance | 23,170 |  | 20,752 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | 1,613 |  | 3,068 |
CLO Fund Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 31,632 |  | 19,583 |
Net accretion | 3,476 |  |  |
Sales/Paydowns/Return of Capital | (5,571) |  | (6,441) |
Total realized gain (loss) included in earnings | (12,054) |  | (5,323) |
Change in unrealized gain (loss) included in earnings | (7,140) |  | 9,355 |
Ending balance | 24,623 |  | 17,174 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | 4,722 |  | 4,031 |
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 | (4,872) |  | 1,697 |
Ending balance | 18,190 |  | 23,946 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date | (4,872) |  | 1,697 |
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 | 2,440 |  | (873) |
Ending balance | 8 |  | $ (1,982) |
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 $14.0 million relating to debt securities and equity securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[2] | Transfers out of Level III represent a transfer of $13.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2021.
[3] | 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.
[4] | Transfers into Level III represent a transfer of $20.1 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2021.

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