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FAIR VALUE MEASUREMENTS - Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 153,325	$ 91,093
Transfers into Level 3	0	6,184
Transfers out of Level 3	0	(9,203)
Included in net income	2,490	19,049
Included in OCI	(2,794)	(56)
Purchases	30,797	273
Sales	0	(26,980)
Settlements/ distributions	(2,573)	(1,823)
Closing balance	181,245	78,537
Change in unrealized investment gains/(losses)	2,490	1,668
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,630	9,122
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(556)	(660)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	5,074	8,462
Change in unrealized investment gains/(losses)	(556)	(660)
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,630	9,122
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(556)	(660)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	5,074	8,462
Change in unrealized investment gains/(losses)	(556)	(660)
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	42,894	14,909
Transfers into Level 3	0	6,184
Transfers out of Level 3	0	(9,203)
Included in net income	0	0
Included in OCI	(2,794)	(56)
Purchases	21,462	0
Sales	0	0
Settlements/ distributions	(672)	(1,349)
Closing balance	60,890	10,485
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	42,894	2,504
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in OCI	(2,794)	(99)
Purchases	21,462	0
Sales	0	0
Settlements/ distributions	(672)	0
Closing balance	60,890	2,405
Change in unrealized investment gains/(losses)	0	0
Fixed maturities, available for sale | CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	1,740
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in OCI	0	14
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	(849)
Closing balance	0	905
Change in unrealized investment gains/(losses)	0	0
Fixed maturities, available for sale | ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	10,665
Transfers into Level 3	0	6,184
Transfers out of Level 3	0	(9,203)
Included in net income	0	0
Included in OCI	0	29
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	(500)
Closing balance	0	7,175
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	110,431	76,184
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	2,490	19,049
Included in OCI	0	0
Purchases	9,335	273
Sales	0	(26,980)
Settlements/ distributions	(1,901)	(474)
Closing balance	120,355	68,052
Change in unrealized investment gains/(losses)	2,490	1,668
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,910	6,173
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	872	570
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	(1,901)	(474)
Closing balance	4,881	6,269
Change in unrealized investment gains/(losses)	872	570
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	104,521	70,011
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	1,618	18,479
Included in OCI	0	0
Purchases	9,335	273
Sales	0	(26,980)
Settlements/ distributions	0	0
Closing balance	115,474	61,783
Change in unrealized investment gains/(losses)	$ 1,618	$ 1,098

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