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DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME - Schedule of Reconciliation to Taxable Income and to Total Distributions Declared to Common Stockholders (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Tax Disclosure [Abstract]                
Net increase in net assets resulting from operations $ 117,083 $ 147,577 $ 48,981 $ 123,671 $ 122,534 $ 116,082 $ 313,641 $ 362,287
Book-tax difference from share-based compensation expense             (6,405) (9,878)
Net unrealized appreciation             (50,126) (107,217)
Income tax provision             26,912 21,360
Pre-tax book income not consolidated for tax purposes             (26,454) (96,943)
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains and changes in estimates             (4,596) 75,778
Estimated taxable income             252,972 245,387
Taxable income earned in prior year and carried forward for distribution in current year             80,058 120,488
Taxable income earned prior to period end and carried forward for distribution next period             (54,868) (105,651)
Dividend payable as of period end and paid in the following period             24,842 22,832
Total distributions accrued or paid to common stockholders             $ 303,004 $ 283,056