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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 91,093	$ 59,283
Transfers into Level 3	6,184	9,185
Transfers out of Level 3	(9,203)	0
Included in net income	19,049	(767)
Included in OCI	(56)	(498)
Purchases	273	427
Sales	(26,980)	0
Settlements/ distributions	(1,823)	(1,259)
Closing balance	78,537	66,371
Change in unrealized investment gains/(losses)	1,668	(767)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	9,122	9,672
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(660)	10,492
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	8,462	20,164
Change in unrealized investment gains/(losses)	(660)	10,492
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	9,122	9,672
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	(660)	10,492
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	8,462	20,164
Change in unrealized investment gains/(losses)	(660)	10,492
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	14,909	8,021
Transfers into Level 3	6,184	9,185
Transfers out of Level 3	(9,203)	0
Included in net income	0	0
Included in OCI	(56)	(498)
Purchases	0	0
Sales	0	0
Settlements/ distributions	(1,349)	(571)
Closing balance	10,485	16,137
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	2,504	2,297
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in OCI	(99)	(52)
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	2,405	2,245
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	1,740	5,235
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in OCI	14	(293)
Purchases	0	0
Sales	0	0
Settlements/ distributions	(849)	(571)
Closing balance	905	4,371
Change in unrealized investment gains/(losses)	0	0
Fixed maturities, available for sale | Non-agency RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	0
Transfers into Level 3	0	9,185
Transfers out of Level 3	0	0
Included in net income	0	0
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	0	9,185
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	10,665	489
Transfers into Level 3	6,184	0
Transfers out of Level 3	(9,203)	0
Included in net income	0	0
Included in OCI	29	(153)
Purchases	0	0
Sales	0	0
Settlements/ distributions	(500)	0
Closing balance	7,175	336
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	76,184	51,262
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	19,049	(767)
Included in OCI	0	0
Purchases	273	427
Sales	(26,980)	0
Settlements/ distributions	(474)	(688)
Closing balance	68,052	50,234
Change in unrealized investment gains/(losses)	1,668	(767)
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	6,173	14,328
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	570	(847)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	(474)	(688)
Closing balance	6,269	12,793
Change in unrealized investment gains/(losses)	570	(847)
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	70,011	36,934
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	18,479	80
Included in OCI	0	0
Purchases	273	427
Sales	(26,980)	0
Settlements/ distributions	0	0
Closing balance	61,783	37,441
Change in unrealized investment gains/(losses)	$ 1,098	$ 80

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