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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 76,094	$ 141,477	$ 43,372	$ 157,048
Included in net investment income
Net foreign exchange gains (losses)	(10)	26	33	23
Purchases	1,222	4,076	42,681	4,217
Settlements	(3,346)	(2,145)	(4,107)	(3,265)
Balance at end of the period	$ 71,244	145,112	$ 71,244	145,112
Significant Unobservable Inputs (Level 3)
Included in net investment income
Sales		$ (3,896)		$ (3,896)
Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income	Net Investment Income	Net Investment Income	Net Investment Income
Included in net investment income
Included in earnings (loss)	$ 1,062	$ 125	$ 1,201	$ 188
Net realized and unrealized gains (losses) on investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net realized and unrealized gains (losses) on investments	Net realized and unrealized gains (losses) on investments	Net realized and unrealized gains (losses) on investments	Net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	$ (3,868)	$ 5,298	$ (12,519)	$ (9,389)
Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (loss)	Other income (loss)	Other income (loss)	Other income (loss)
Included in net investment income
Included in earnings (loss)	$ 90	$ 151	$ 583	$ 186
Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	40,936		0
Included in net investment income
Net foreign exchange gains (losses)	0		0
Purchases	222		41,681
Settlements	(3,313)		(3,836)
Balance at end of the period	38,825		38,825
Asset-backed | Net investment income
Included in net investment income
Included in earnings (loss)	980		980
Asset-backed | Net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	0		0
Asset-backed | Other income (loss)
Included in net investment income
Included in earnings (loss)	0		0
Direct Private Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	35,308	45,278	43,777	59,905
Included in net investment income
Net foreign exchange gains (losses)	(10)	26	33	23
Purchases	1,000	577	1,000	577
Settlements	0	0	0	0
Balance at end of the period	32,512	51,034	32,512	51,034
Direct Private Equity Investments | Significant Unobservable Inputs (Level 3)
Included in net investment income
Sales		(270)		(270)
Direct Private Equity Investments | Net investment income
Included in net investment income
Included in earnings (loss)	82	125	221	188
Direct Private Equity Investments | Net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	(3,868)	5,298	(12,519)	(9,389)
Direct Private Equity Investments | Other income (loss)
Included in net investment income
Included in earnings (loss)	0	0	0	0
Term Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period		96,639		97,658
Included in net investment income
Net foreign exchange gains (losses)		0		0
Purchases		0		0
Settlements		(2,064)		(3,083)
Balance at end of the period		94,575		94,575
Term Loans | Significant Unobservable Inputs (Level 3)
Included in net investment income
Sales		0		0
Term Loans | Net investment income
Included in net investment income
Included in earnings (loss)		0		0
Term Loans | Net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)		0		0
Term Loans | Other income (loss)
Included in net investment income
Included in earnings (loss)		0		0
Other Assets and (Liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	(150)	(440)	(405)	(515)
Included in net investment income
Net foreign exchange gains (losses)	0	0	0	0
Purchases	0	3,499	0	3,640
Settlements	(33)	(81)	(271)	(182)
Balance at end of the period	(93)	(497)	(93)	(497)
Other Assets and (Liabilities) | Significant Unobservable Inputs (Level 3)
Included in net investment income
Sales		(3,626)		(3,626)
Other Assets and (Liabilities) | Net investment income
Included in net investment income
Included in earnings (loss)	0	0	0	0
Other Assets and (Liabilities) | Net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	0	0	0	0
Other Assets and (Liabilities) | Other income (loss)
Included in net investment income
Included in earnings (loss)	$ 90	$ 151	$ 583	$ 186

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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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