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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
 6 Months Ended
Jun. 30, 2023
Jun. 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 (10,599) [1] (17,056) [2]
Transfers into Level III 10,286 [3] 19,847 [4]
Net accretion 5,012 8,090
Purchases 18,702 110,066
Sales/Paydowns/Return of Capital (68,959) (84,189)
Total realized gain (loss) included in earnings (9,492) (19,453)
Change in unrealized gain (loss) included in earnings (9,544) 7,135
Ending balance 406,576 490,146
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (14,280) 8,689
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 (10,599) [1] (17,056) [2]
Transfers into Level III 10,286 [3] 19,847 [4]
Net accretion 3,635 5,528
Purchases 18,298 106,839
Sales/Paydowns/Return of Capital (66,460) (78,318)
Total realized gain (loss) included in earnings (1,191) (13,198)
Change in unrealized gain (loss) included in earnings (7,120) 6,045
Ending balance 356,993 422,119
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (12,868) (7,781)
Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 21,905 20,992
Purchases 404 3,227
Sales/Paydowns/Return of Capital (1,526) (3,347)
Total realized gain (loss) included in earnings 1,175 471
Change in unrealized gain (loss) included in earnings (1,945) 1,988
Ending balance 20,013 23,331
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (933) 2,419
CLO Fund Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 20,453 31,632
Net accretion 1,377 2,562
Sales/Paydowns/Return of Capital (973) (4,611)
Total realized gain (loss) included in earnings (9,476) (4,631)
Change in unrealized gain (loss) included in earnings 1,615 (681)
Ending balance 12,996 24,271
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date 1,615 (681)
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 (2,094) (2,659)
Ending balance 16,574 20,403
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date $ (2,094) (2,658)
Derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance   (2,412)
Sales/Paydowns/Return of Capital   2,087
Total realized gain (loss) included in earnings   (2,095)
Change in unrealized gain (loss) included in earnings   2,442
Ending balance   22
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date   $ 12
[1] Transfers out of Level III represent a transfer of $10.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2023.
[2] Transfers out of Level III represent a transfer of $17.1 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2022.
[3] Transfers into Level III represent a transfer of $10.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2023.
[4] Transfers into Level III represent a transfer of $19.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2022.