v3.25.4
FAIR VALUE MEASUREMENTS - Level III Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-controlled/non-affiliated investments Non-controlled/non-affiliated investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period $ 5,506,793 $ 2,768,402
Purchases of investments 1,683,684 [1] 3,408,076 [2]
Proceeds from principal repayments and sales of investments (1,198,424) [1] (677,089) [3]
Accretion of discount/amortization of premium 23,942 19,405
Payment-in-kind 25,664 19,442
Transfers into/out of Level 3 2,069 [4] (18,059) [5]
Fair value, end of period 5,977,285 5,506,793
Net change in unrealized appreciation (depreciation) from investments still held $ (52,718) $ 7,310
Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-controlled/non-affiliated investments Non-controlled/non-affiliated investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings $ (56,069) $ 8,282
Net realized gains (losses)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-controlled/non-affiliated investments Non-controlled/non-affiliated investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings $ (10,374) $ (21,666)
First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 5,442,166 2,710,858
Purchases of investments 1,658,225 [1] 3,384,782 [2]
Proceeds from principal repayments and sales of investments (1,188,702) [1] (659,416) [3]
Accretion of discount/amortization of premium 23,843 18,946
Payment-in-kind 18,633 13,294
Transfers into/out of Level 3 2,069 [4] (18,059) [5]
Fair value, end of period 5,894,570 5,442,166
Net change in unrealized appreciation (depreciation) from investments still held (44,758) 2,440
First Lien Debt | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings (48,017) 2,740
First Lien Debt | Net realized gains (losses)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings (13,647) (10,979)
Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 2,112 21,708
Purchases of investments 13,407 [1] 2,406 [2]
Proceeds from principal repayments and sales of investments 0 [1] (17,500) [3]
Accretion of discount/amortization of premium 1 393
Payment-in-kind 616 45
Transfers into/out of Level 3 0 [4] 0 [5]
Fair value, end of period 16,136 2,112
Net change in unrealized appreciation (depreciation) from investments still held 0 4,893
Second Lien Debt | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings 0 5,565
Second Lien Debt | Net realized gains (losses)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings 0 (10,505)
Other Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 6,520 2,484
Purchases of investments 4,468 [1] 3,537 [2]
Proceeds from principal repayments and sales of investments 0 [1] 0 [3]
Accretion of discount/amortization of premium 98 66
Payment-in-kind 990 350
Total gains (losses) included in earnings [5]   0
Transfers into/out of Level 3 [4] 0  
Fair value, end of period 11,564 6,520
Net change in unrealized appreciation (depreciation) from investments still held (512) 83
Other Debt | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings (512) 83
Other Debt | Net realized gains (losses)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings 0 0
Equity [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 55,995 33,352
Purchases of investments 7,584 [1] 17,351 [2]
Proceeds from principal repayments and sales of investments (9,722) [1] (173) [3]
Accretion of discount/amortization of premium 0 0
Payment-in-kind 5,425 5,753
Transfers into/out of Level 3 0 [4] 0 [5]
Fair value, end of period 55,015 55,995
Net change in unrealized appreciation (depreciation) from investments still held (7,448) (106)
Equity [Member] | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings (7,540) (106)
Equity [Member] | Net realized gains (losses)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) included in earnings $ 3,273 $ (182)
[1] Purchases may include investments received in corporate action and restructurings.
[2] Purchases may include investments received in corporate action and restructurings.
[3] Sales may include investments received in corporate action and restructurings.
[4] Transfer of portfolio investments within the three-level hierarchy is recorded during the period of such reclassification occurrence at the fair value as of the beginning of the respective period. Generally, reclassifications are primarily due to increase/decrease of price transparency.
[5] Transfer of portfolio investments within the three-level hierarchy is recorded during the period of such reclassification occurrence at the fair value as of the beginning of the respective period. Generally, reclassifications are primarily due to increase/decrease of price transparency.