v3.26.1
Fair Value - Level III Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,369,915 $ 1,338,656 $ 1,397,416 $ 1,334,581
Purchases, including capitalized PIK and revolver fundings (1) 65,879 82,162 96,894 133,265
Proceeds from sales and paydowns of investments (1) (118,303) (101,049) (184,563) (172,526)
Transfers into Level III 9,166 31,468 40,076 49,455
Transfers out of Level III (1,816) (8,732) (9,849)  
Ending balance 1,321,348 1,335,804 1,321,348 1,335,804
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (2,940) (7,717) (18,711) (10,268)
Total | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings (5,219) (18) (5,562) (3,806)
Total | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 1,726 (6,683) (13,064) (5,165)
First lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,329,977 1,299,363 1,348,090 1,313,264
Purchases, including capitalized PIK and revolver fundings (1) 57,246 81,439 87,806 125,234
Proceeds from sales and paydowns of investments (1) (116,148) (101,049) (182,408) (172,526)
Transfers into Level III 5,168 25,490 36,078 32,445
Transfers out of Level III (1,816) (8,732) (1,816)  
Ending balance 1,271,134 1,290,511 1,271,134 1,290,511
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (2,740) (7,017) (14,961) (9,203)
First lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings (5,219) (18) (5,562) (3,806)
First lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 1,926 (5,982) (11,054) (4,100)
Second lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 11,583 21,220 19,288 10,488
Purchases, including capitalized PIK and revolver fundings (1) 0 0 0 0
Proceeds from sales and paydowns of investments (1) 0 0 0 0
Transfers into Level III 3,998 5,978 3,998 17,010
Transfers out of Level III 0 0 (8,033)  
Ending balance 16,915 26,843 16,915 26,843
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 1,334 (354) (78) (655)
Second lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 0 0 0 0
Second lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 1,334 (355) 1,662 (655)
Subordinated        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 11,821 8,092 11,549 4,766
Purchases, including capitalized PIK and revolver fundings (1) 1,957 271 2,346 3,524
Proceeds from sales and paydowns of investments (1) 0 0 0 0
Transfers into Level III 0 0 0 0
Transfers out of Level III 0 0 0  
Ending balance 13,778 8,398 13,778 8,398
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 0 35 (117) 108
Subordinated | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 0 0 0 0
Subordinated | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 0 35 (117) 108
Equity and other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 16,534 9,981 18,489 6,063
Purchases, including capitalized PIK and revolver fundings (1) 6,676 452 6,742 4,507
Proceeds from sales and paydowns of investments (1) (2,155) 0 (2,155) 0
Transfers into Level III 0 0 0 0
Transfers out of Level III 0 0 0  
Ending balance 19,521 10,052 19,521 10,052
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (1,534) (381) (3,555) (518)
Equity and other | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings 0 0 0 0
Equity and other | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings $ (1,534) $ (381) $ (3,555) $ (518)