v3.26.1
Fair Value Measurements - Schedule of Changes in Level 3 Investment Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Net realized gains/(losses) $ 254 $ 0 $ (95) $ 0  
Level 3          
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Balance, Beginning of Period 825,466 827,627 849,271 804,028 $ 804,028
Purchases 57,368 58,303 84,755 111,421  
Payment-in-kind and other adjustments to cost (4,379)   1,119 522  
Investment increases due to payment-in-kind income   (71)      
Principal repayments   (71,784)      
Repayments of investments (40,331)   (88,771) (97,532)  
Net realized gains/(losses) 253   (95)    
Net amortization of premium/discount 942 751 1,600 1,315  
Net change in unrealized gains/(losses) $ (2,745) $ (7,524) $ (11,305) $ (12,452)  
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement of Income Extensible List not Disclosed Flag true true true true  
Transfers into Level 3     $ 0   0
Balance, End of Period $ 836,574 $ 807,302 836,574 $ 807,302 849,271
Net change in unrealized appreciation/(depreciation) for investments still held $ (2,741) $ (7,526) $ (36,134) $ (31,548)  
Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag true true true true  
Level 3 | Senior Secured First Lien Loans          
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Balance, Beginning of Period $ 644,368 $ 659,058 $ 673,630 $ 627,439 627,439
Purchases 50,495 54,128 70,965 103,486  
Payment-in-kind and other adjustments to cost (4,321)   949 1,563  
Investment increases due to payment-in-kind income   504      
Principal repayments   (60,383)      
Repayments of investments (32,784)   (80,497) (78,424)  
Net realized gains/(losses) 253   253    
Net amortization of premium/discount 942 751 1,600 1,315  
Net change in unrealized gains/(losses) (3,576) (4,806) (11,523) (6,127)  
Balance, End of Period 655,377 649,252 655,377 649,252 673,630
Net change in unrealized appreciation/(depreciation) for investments still held (3,572) (4,805) (23,075) (13,052)  
Level 3 | Equity          
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Balance, Beginning of Period 9,466 3,765 9,939 4,437 4,437
Purchases 130 8 275 376  
Payment-in-kind and other adjustments to cost 1   2    
Principal repayments   8      
Repayments of investments (6)   (6) (301)  
Net realized gains/(losses)     (348)    
Net change in unrealized gains/(losses) (248) (60) (519) (791)  
Balance, End of Period 9,343 3,721 9,343 3,721 9,939
Net change in unrealized appreciation/(depreciation) for investments still held (248) (63) (1,536) (1,132)  
Level 3 | Subordinated Certificates Of SDLP          
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Balance, Beginning of Period 171,632 164,804 165,702 172,152 172,152
Purchases 6,743 4,167 13,515 7,559  
Payment-in-kind and other adjustments to cost (59)   168 (1,041)  
Investment increases due to payment-in-kind income   (575)      
Principal repayments   (11,409)      
Repayments of investments (7,541)   (8,268) (18,807)  
Net change in unrealized gains/(losses) 1,079 (2,658) 737 (5,534)  
Balance, End of Period 171,854 154,329 171,854 154,329 $ 165,702
Net change in unrealized appreciation/(depreciation) for investments still held $ 1,079 $ (2,658) $ (11,523) $ (17,364)