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FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of the Beginning and Ending Balances for Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,986,257 $ 1,911,267 $ 1,994,227 $ 1,598,514
Purchase of investments and other adjustments to cost 33,846 201,619 265,805 655,865
Proceeds from principal repayments and sales of investments (58,392) (125,011) (296,344) (267,474)
Payment-in-kind interest 2,369 2,503 6,998 6,024
Amortization of premium/accretion of discount, net 475 827 3,051 538
Transfers out of Level 3 (17,123) (17,813) (17,088) (11,899)
Transfers to level 3 2,527 16,525 13,204 19,500
Ending balance 1,947,254 1,994,851 1,947,254 1,994,851
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments still held (3,292) 4,502 (16,241) (9,815)
First-Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,790,722 1,724,399 1,806,850 1,393,011
Purchase of investments and other adjustments to cost 28,804 185,445 250,023 626,552
Proceeds from principal repayments and sales of investments (54,682) (120,908) (282,919) (244,709)
Payment-in-kind interest 517 172 1,378 580
Amortization of premium/accretion of discount, net 500 708 1,197 118
Transfers out of Level 3 (8,262) (17,813) (15,433) (11,899)
Transfers to level 3 2,527 16,525 13,204 19,500
Ending balance 1,760,059 1,791,571 1,760,059 1,791,571
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments still held (244) 2,661 (6,877) 5,370
Subordinated Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 160,006 154,692 150,779 174,696
Purchase of investments and other adjustments to cost 3,444 14,802 12,896 24,953
Proceeds from principal repayments and sales of investments (2,270) (4,103) (11,733) (22,692)
Payment-in-kind interest 1,852 2,331 5,620 5,444
Amortization of premium/accretion of discount, net (25) 119 259 420
Transfers out of Level 3 (8,861) 0 0 0
Transfers to level 3 0 0 0 0
Ending balance 152,778 169,455 152,778 169,455
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments still held (1,380) 1,564 (5,157) (13,916)
Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 35,529 32,176 36,598 30,807
Purchase of investments and other adjustments to cost 1,598 1,372 2,886 4,360
Proceeds from principal repayments and sales of investments (1,440) 0 (1,692) (73)
Payment-in-kind interest 0 0 0 0
Amortization of premium/accretion of discount, net 0 0 1,595 0
Transfers out of Level 3 0 0 (1,655) 0
Transfers to level 3 0 0 0 0
Ending balance 34,417 33,825 34,417 33,825
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments still held (1,668) 277 (4,207) (1,269)
Net realized gain (loss) on investments | Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings 1,496 913 (8,201) (1,801)
Net realized gain (loss) on investments | First-Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings 282 810 (9,670) (2,176)
Net realized gain (loss) on investments | Subordinated Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings 42 103 148 375
Net realized gain (loss) on investments | Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings 1,172 0 1,321 0
Net change in unrealized appreciation (depreciation) on investments | Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings (4,201) 4,021 (14,398) (4,416)
Net change in unrealized appreciation (depreciation) on investments | First-Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings (349) 2,233 (4,571) 10,594
Net change in unrealized appreciation (depreciation) on investments | Subordinated Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings (1,410) 1,511 (5,191) (13,741)
Net change in unrealized appreciation (depreciation) on investments | Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains (losses) included in earnings $ (2,442) $ 277 $ (4,636) $ (1,269)