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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
Dec. 31, 2024
Dec. 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 [1]   (19,199)
Transfers into Level III 65,325 [2] 1,643 [3]
Net accretion 4,618 7,315
Purchases 80,875 42,233
Sales/Paydowns/Return of Capital (117,271) (120,635)
Total realized gain (loss) included in earnings (29,380) (23,940)
Change in unrealized gain (loss) included in earnings 2,188 (1,059)
Ending balance 363,883 357,528
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date $ (26,976) $ (13,680)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gross Investment Income, Operating Gross Investment Income, Operating
First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 289,295 $ 359,648
Transfers out of Level III [1]   (18,021)
Transfers into Level III [2] 47,303  
Net accretion 2,991 5,034
Purchases 70,344 40,727
Sales/Paydowns/Return of Capital (101,614) (95,846)
Total realized gain (loss) included in earnings (11,908) (704)
Change in unrealized gain (loss) included in earnings (6,454) (1,543)
Ending balance 289,957 289,295
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (18,958) (6,242)
Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 23,232 50,453
Transfers out of Level III [1]   (1,178)
Transfers into Level III 18,022 [2] 1,643 [3]
Net accretion 116 283
Purchases 2,361 857
Sales/Paydowns/Return of Capital (10,526) (26,708)
Total realized gain (loss) included in earnings (7,868) (1,124)
Change in unrealized gain (loss) included in earnings 3,659 (994)
Ending balance 28,996 23,232
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (2,312) (2,037)
Subordinated Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 1,225 43
Purchases 997  
Sales/Paydowns/Return of Capital (511) 5,568
Total realized gain (loss) included in earnings (417)  
Change in unrealized gain (loss) included in earnings 446 (4,386)
Ending balance 1,740 1,225
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (1,932) (4,388)
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 20,533 21,905
Purchases 7,173 649
Sales/Paydowns/Return of Capital 78 (1,552)
Total realized gain (loss) included in earnings (6,611) 3,334
Change in unrealized gain (loss) included in earnings 3,589 (3,803)
Ending balance 24,762 20,533
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date (4,721) (2,082)
Collateralized Loan Obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 8,968 20,453
Net accretion 1,511 1,998
Sales/Paydowns/Return of Capital (2,722) (2,097)
Total realized gain (loss) included in earnings (2,576) (25,446)
Change in unrealized gain (loss) included in earnings 12 14,060
Ending balance 5,193 8,968
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date 11 5,461
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 (1,976)  
Change in unrealized gain (loss) included in earnings 716 (4,393)
Ending balance 13,015 14,275
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date 716 $ (4,392)
Derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized gain (loss) included in earnings 220  
Ending balance 220  
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date $ 220  
[1] Transfers out of Level III represent a transfer of $19.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of December 31, 2023
[2] Transfers into Level III represent a transfer of $65.3 million relating to debt securities for which pricing inputs were unobservable as of December 31, 2024.
[3] Transfers into Level III represent a transfer of $1.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of December 31, 2023.