FAIR VALUE MEASUREMENTS - Schedule of Level 3 Input Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	$ 1,951,269	$ 1,820,318
Purchases	1,354,253	604,655
Sales	(74,465)	(63,292)
Paydowns	(567,452)	(387,081)
Accretion of discount	10,462	9,497
Balance, end of year	2,651,286	1,951,269
Net change in unrealized appreciation (depreciation) relating to Level 3 investments still held at the reporting date and included within the Consolidated Statements of Operations	(3,532)	(24,400)
Total | Net realized gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	(55,489)	(52,258)
Total | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	32,708	19,430
First Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	1,720,761	1,572,751
Purchases	1,269,035	509,261
Sales	(58,126)	(39,075)
Paydowns	(529,272)	(315,557)
Accretion of discount	9,387	8,184
Balance, end of year	2,383,274	1,720,761
Net change in unrealized appreciation (depreciation) relating to Level 3 investments still held at the reporting date and included within the Consolidated Statements of Operations	(9,969)	(6,269)
First Lien Debt | Net realized gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	(35,195)	(51,805)
First Lien Debt | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	6,684	37,002
Second Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	92,724	186,479
Purchases	3,231	13,852
Sales	(2,599)	(22,693)
Paydowns	(38,180)	(66,975)
Accretion of discount	849	1,116
Balance, end of year	55,729	92,724
Net change in unrealized appreciation (depreciation) relating to Level 3 investments still held at the reporting date and included within the Consolidated Statements of Operations	356	(18,326)
Second Lien Debt | Net realized gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	(18,011)	(2,444)
Second Lien Debt | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	17,715	(16,611)
Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	75,313	61,088
Purchases	33,403	19,008
Sales	(13,740)	(1,524)
Paydowns	0	(4,549)
Accretion of discount	223	197
Balance, end of year	100,355	75,313
Net change in unrealized appreciation (depreciation) relating to Level 3 investments still held at the reporting date and included within the Consolidated Statements of Operations	5,211	258
Equity Investments | Net realized gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	(2,283)	1,991
Equity Investments | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	7,439	(898)
Structured Credit Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	62,471	0
Purchases	48,584	62,534
Sales	0	0
Paydowns	0	0
Accretion of discount	3	0
Balance, end of year	111,928	62,471
Net change in unrealized appreciation (depreciation) relating to Level 3 investments still held at the reporting date and included within the Consolidated Statements of Operations	870	(63)
Structured Credit Investments | Net realized gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	0	0
Structured Credit Investments | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	$ 870	$ (63)