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FAIR VALUE MEASUREMENTS - Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 181,245	$ 78,537	$ 153,325	$ 91,093
Transfers into Level 3	0	19,382	0	25,566
Transfers out of Level 3	0	(7,004)	0	(16,207)
Included in net income	(4,307)	1,413	(1,816)	20,462
Included in OCI	(3,828)	26	(6,623)	(29)
Purchases	23,374	16,300	54,171	16,573
Sales	0	0	0	(26,980)
Settlements/ distributions	(2,876)	(1,580)	(5,449)	(3,404)
Closing balance	193,608	107,074	193,608	107,074
Change in unrealized investment gains/(losses)	(4,307)	1,413	(1,816)	3,081
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,074	8,462	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	(366)	(345)	(922)	(1,005)
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	4,708	8,117	4,708	8,117
Change in unrealized investment gains/(losses)	(366)	(345)	(922)	(1,005)
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,074	8,462	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	(366)	(345)	(922)	(1,005)
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	4,708	8,117	4,708	8,117
Change in unrealized investment gains/(losses)	(366)	(345)	(922)	(1,005)
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	60,890	10,485	42,894	14,909
Transfers into Level 3	0	19,382	0	25,566
Transfers out of Level 3	0	(7,004)	0	(16,207)
Included in net income	0	0	0	0
Included in OCI	(3,828)	26	(6,623)	(29)
Purchases	15,768	13,300	37,231	13,300
Sales	0		0	0
Settlements/ distributions	0	(903)	(672)	(2,253)
Closing balance	72,830	35,286	72,830	35,286
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	60,890	2,405	42,894	2,504
Transfers into Level 3	0	7,000	0	7,000
Transfers out of Level 3	0	0	0	0
Included in net income	0	0	0	0
Included in OCI	(3,828)	21	(6,623)	(78)
Purchases	15,768	13,300	37,231	13,300
Sales	0	0	0	0
Settlements/ distributions	0	0	(672)	0
Closing balance	72,830	22,726	72,830	22,726
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	905	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	(2)	0	13
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	(903)	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	7,175	0	10,665
Transfers into Level 3	0	12,382	0	18,566
Transfers out of Level 3	0	(7,004)	0	(16,207)
Included in net income	0	0	0	0
Included in OCI	0	7	0	36
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	0	0	0	(500)
Closing balance	0	12,560	0	12,560
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	120,355	68,052	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	(4,307)	1,413	(1,816)	20,462
Included in OCI	0	0	0	0
Purchases	7,606	3,000	16,940	3,273
Sales	0	0	0	(26,980)
Settlements/ distributions	(2,876)	(677)	(4,777)	(1,151)
Closing balance	120,778	71,788	120,778	71,788
Change in unrealized investment gains/(losses)	(4,307)	1,413	(1,816)	3,081
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	4,881	6,269	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	803	1,410	1,675	1,980
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	(876)	(677)	(2,777)	(1,151)
Closing balance	4,808	7,002	4,808	7,002
Change in unrealized investment gains/(losses)	803	1,410	1,675	1,980
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	115,474	61,783	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	(5,110)	3	(3,491)	18,482
Included in OCI	0	0	0	0
Purchases	7,606	3,000	16,940	3,273
Sales	0	0	0	(26,980)
Settlements/ distributions	(2,000)	0	(2,000)	0
Closing balance	115,970	64,786	115,970	64,786
Change in unrealized investment gains/(losses)	$ (5,110)	$ 3	$ (3,491)	$ 1,101

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