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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
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 157,048	$ 164,948
Included in net investment income
Total foreign exchange gains (losses)	(4)	(19)
Purchases	141	(300)
Settlements	(225)	0
Balance at end of the period	$ 156,880	$ 166,420
Included in 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
Included in net investment income
Included in earnings (loss)	$ 63	$ 62
Included in 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
Included in net investment income
Included in earnings (loss)	$ 0	$ 709
Included in 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)
Included in net investment income
Included in earnings (loss)	$ (143)	$ 1,020
Direct private equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	59,905	66,780
Included in net investment income
Total foreign exchange gains (losses)	(4)	(19)
Purchases	0	0
Settlements	0
Balance at end of the period	59,964	67,532
Direct private equity investments | Included in net investment income
Included in net investment income
Included in earnings (loss)	63	62
Direct private equity investments | Included in net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	0	709
Direct private equity investments | Included in other income (loss)
Included in net investment income
Included in earnings (loss)	0	0
Term loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	97,658	100,000
Included in net investment income
Total foreign exchange gains (losses)	0	0
Purchases	0	0
Settlements	(225)	0
Balance at end of the period	97,433	100,000
Term loans | Included in net investment income
Included in net investment income
Included in earnings (loss)	0	0
Term loans | Included in net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	0	0
Term loans | Included in 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	(515)	(1,832)
Included in net investment income
Total foreign exchange gains (losses)	0	0
Purchases	141	(300)
Settlements	0	0
Balance at end of the period	(517)	(1,112)
Other Assets and (Liabilities) | Included in net investment income
Included in net investment income
Included in earnings (loss)	0	0
Other Assets and (Liabilities) | Included in net realized and unrealized gains (losses) on investments
Included in net investment income
Included in earnings (loss)	0	0
Other Assets and (Liabilities) | Included in other income (loss)
Included in net investment income
Included in earnings (loss)	$ (143)	$ 1,020

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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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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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