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FAIR VALUE MEASUREMENTS - Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 260,278	$ 153,325
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	740	2,490
Included in OCI	1,183	(2,794)
Purchases	23,369	30,797
Sales	0	0
Settlements/ distributions	(9,171)	(2,573)
Closing balance	276,399	181,245
Change in unrealized investment gains/(losses)	747	2,490
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	5,630
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	(556)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	0	5,074
Change in unrealized investment gains/(losses)	0	(556)
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	5,630
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	(556)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	0	5,074
Change in unrealized investment gains/(losses)	0	(556)
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	119,104	42,894
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(7)	0
Included in OCI	1,183	(2,794)
Purchases	18,910	21,462
Sales	0	0
Settlements/ distributions	(8,763)	(672)
Closing balance	130,427	60,890
Change in unrealized investment gains/(losses)	0	0
Fixed maturities, available for sale | Corporate debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	119,104	42,894
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(7)	0
Included in OCI	1,183	(2,794)
Purchases	18,910	21,462
Sales	0	0
Settlements/ distributions	(8,763)	(672)
Closing balance	130,427	60,890
Change in unrealized investment gains/(losses)	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	141,174	110,431
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	747	2,490
Included in OCI	0	0
Purchases	4,459	9,335
Sales	0	0
Settlements/ distributions	(408)	(1,901)
Closing balance	145,972	120,355
Change in unrealized investment gains/(losses)	747	2,490
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,016	5,910
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	411	872
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	(408)	(1,901)
Closing balance	5,019	4,881
Change in unrealized investment gains/(losses)	411	872
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	136,158	104,521
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	336	1,618
Included in OCI	0	0
Purchases	4,459	9,335
Sales	0	0
Settlements/ distributions	0	0
Closing balance	140,953	115,474
Change in unrealized investment gains/(losses)	$ 336	$ 1,618

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

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-Section 50
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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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