v3.25.4
Fair Value Measurements - Reconciliation of Beginning and Ending Balances for Investments at Fair Value that Use Level 3 Inputs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
investment
Dec. 31, 2024
USD ($)
investment
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning $ 424,257 $ 455,007
Purchases of investments and other adjustments to cost 51,231 97,954
Proceeds from principal payments and sales of investments (127,914) (113,667)
Reclassifications 0 0
Transfers in (out) of Level 3   (335)
Balance at the end $ 334,855 $ 424,257
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized gain (loss) of investments Unrealized gain (loss) of investments
Total net change in unrealized gain (loss) on investments attributable to Level 3 investments still held $ (10,650) $ (13,816)
Number of investments transferred from level 3 | investment 0 1
Senior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning $ 357,994 $ 388,882
Purchases of investments and other adjustments to cost 39,889 87,569
Proceeds from principal payments and sales of investments (124,820) (96,577)
Reclassifications (906) (11,633)
Transfers in (out) of Level 3   0
Balance at the end 263,219 357,994
Unitranche secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 3,862 13,877
Purchases of investments and other adjustments to cost 8 130
Proceeds from principal payments and sales of investments (1,676) (10,037)
Reclassifications 0 0
Transfers in (out) of Level 3   0
Balance at the end 2,183 3,862
Junior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 29,634 26,594
Purchases of investments and other adjustments to cost 8,555 5,346
Proceeds from principal payments and sales of investments (982) (5,977)
Reclassifications 906 5,974
Transfers in (out) of Level 3   0
Balance at the end 35,180 29,634
Equity investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Balance at the beginning 32,767 25,654
Purchases of investments and other adjustments to cost 2,779 4,909
Proceeds from principal payments and sales of investments (436) (1,076)
Reclassifications 0 5,659
Transfers in (out) of Level 3   (335)
Balance at the end $ 34,273 $ 32,767
Net realized gain (loss) on investments    
Fair Value Measurements    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ (2,859) $ 686
Net realized gain (loss) on investments | Senior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings (862) 52
Net realized gain (loss) on investments | Unitranche secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings 0 0
Net realized gain (loss) on investments | Junior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings (2,029) 0
Net realized gain (loss) on investments | Equity investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ 32 $ 634
Net change in unrealized gain (loss) on investments    
Fair Value Measurements    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized gain (loss) of investments Non-controlled/non-affiliate company investments
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ (9,860) $ (15,388)
Net change in unrealized gain (loss) on investments | Senior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings (8,076) (10,299)
Net change in unrealized gain (loss) on investments | Unitranche secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings (11) (108)
Net change in unrealized gain (loss) on investments | Junior secured loans    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings (904) (2,303)
Net change in unrealized gain (loss) on investments | Equity investments    
Reconciliation of beginning and ending balances for investments at fair value that use Level 3 inputs    
Gains (losses) included in earnings $ (869) $ (2,678)