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FAIR VALUE MEASUREMENTS - Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 193,608	$ 107,074	$ 153,325	$ 91,093
Transfers into Level 3	0	0	0	25,566
Transfers out of Level 3	0	(12,582)	0	(28,789)
Included in net income	2,105	569	290	21,031
Included in OCI	(3,977)	(99)	(10,600)	(128)
Purchases	30,300	28,436	84,472	45,010
Sales	0	0	0	(26,980)
Settlements/ distributions	(999)	(3,984)	(6,450)	(7,389)
Closing balance	221,037	119,414	221,037	119,414
Change in unrealized investment gains/(losses)	2,139	569	324	3,651
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	4,708	8,117	5,630	9,122
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(422)	(398)	(1,344)	(1,403)
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	0	0	0
Closing balance	4,286	7,719	4,286	7,719
Change in unrealized investment gains/(losses)	(422)	(398)	(1,344)	(1,403)
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	4,708	8,117	5,630	9,122
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(422)	(398)	(1,344)	(1,403)
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	0	0	0
Closing balance	4,286	7,719	4,286	7,719
Change in unrealized investment gains/(losses)	(422)	(398)	(1,344)	(1,403)
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	72,830	35,286	42,894	14,909
Transfers into Level 3	0	0	0	25,566
Transfers out of Level 3	0	(12,582)	0	(28,789)
Included in net income	(34)	0	(34)	0
Included in OCI	(3,977)	(99)	(10,600)	(128)
Purchases	27,600	25,000	64,832	38,300
Sales	0	0	0	0
Settlements/ distributions	(468)	0	(1,141)	(2,253)
Closing balance	95,951	47,605	95,951	47,605
Change in unrealized investment gains/(losses)	0	0	0	0
Fixed maturities, available for sale | Corporate debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	72,830	22,726	42,894	2,504
Transfers into Level 3	0	0	0	7,000
Transfers out of Level 3	0	0	0	0
Included in net income	(34)	0	(34)	0
Included in OCI	(3,977)	(121)	(10,600)	(199)
Purchases	27,600	25,000	64,832	38,300
Sales	0	0	0	0
Settlements/ distributions	(468)	0	(1,141)	0
Closing balance	95,951	47,605	95,951	47,605
Change in unrealized investment gains/(losses)	0	0	0	0
Fixed maturities, available for sale | CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	0	0	1,740
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	0	0	0	0
Included in OCI	0	0	0	13
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	0	0	(1,753)
Closing balance	0	0	0	0
Change in unrealized investment gains/(losses)	0	0	0	0
Fixed maturities, available for sale | ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	12,560	0	10,665
Transfers into Level 3	0	0	0	18,566
Transfers out of Level 3	0	(12,582)	0	(28,789)
Included in net income	0	0	0	0
Included in OCI	0	22	0	58
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	0	0	(500)
Closing balance	0	0	0	0
Change in unrealized investment gains/(losses)	0	0	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	120,778	71,788	110,431	76,184
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	2,139	569	324	21,031
Included in OCI	0	0	0	0
Purchases	2,700	3,436	19,640	6,710
Sales	0	0	0	(26,980)
Settlements/ distributions	(531)	(3,984)	(5,309)	(5,136)
Closing balance	125,086	71,809	125,086	71,809
Change in unrealized investment gains/(losses)	2,139	569	324	3,651
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	4,808	7,002	5,910	6,173
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	890	356	2,566	2,337
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	(531)	(1,061)	(3,309)	(2,213)
Closing balance	5,167	6,297	5,167	6,297
Change in unrealized investment gains/(losses)	890	356	2,566	2,337
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	115,970	64,786	104,521	70,011
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	1,249	213	(2,242)	18,694
Included in OCI	0	0	0	0
Purchases	2,700	3,436	19,640	6,710
Sales	0	0	0	(26,980)
Settlements/ distributions	0	(2,923)	(2,000)	(2,923)
Closing balance	119,919	65,512	119,919	65,512
Change in unrealized investment gains/(losses)	$ 1,249	$ 213	$ (2,242)	$ 1,314

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