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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
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.