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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 276,399	$ 181,245	$ 260,278	$ 153,325
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(9,042)	(4,307)	(8,303)	(1,816)
Included in OCI	(1,354)	(3,828)	(170)	(6,623)
Purchases	20,409	23,374	43,778	54,171
Sales	(34,532)	0	(34,532)	0
Settlements/ distributions	(2,909)	(2,876)	(12,080)	(5,449)
Closing balance	248,971	193,608	248,971	193,608
Change in unrealized investment gains/(losses)	(13,821)	(4,307)	(13,073)	(1,816)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	5,074	0	5,630
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	0	(366)	0	(922)
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	0	4,708	0	4,708
Change in unrealized investment gains/(losses)	0	(366)	0	(922)
Other liabilities | Derivative instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	5,074	0	5,630
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	0	(366)	0	(922)
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	0	4,708	0	4,708
Change in unrealized investment gains/(losses)	0	(366)	0	(922)
Fixed maturities, available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	130,427	60,890	119,104	42,894
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(3,304)	0	(3,311)	0
Included in OCI	(1,354)	(3,828)	(170)	(6,623)
Purchases	5,551	15,768	24,461	37,231
Sales	0	0	0	0
Settlements/ distributions	(2,274)	0	(11,038)	(672)
Closing balance	129,046	72,830	129,046	72,830
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	130,427	60,890	119,104	42,894
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(3,304)	0	(3,311)	0
Included in OCI	(1,354)	(3,828)	(170)	(6,623)
Purchases	5,551	15,768	24,461	37,231
Sales	0	0	0	0
Settlements/ distributions	(2,274)	0	(11,038)	(672)
Closing balance	129,046	72,830	129,046	72,830
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	145,972	120,355	141,174	110,431
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0		0	0
Included in net income	(5,738)	(4,307)	(4,992)	(1,816)
Included in OCI	0	0	0	0
Purchases	14,858	7,606	19,317	16,940
Sales	(34,532)	0	(34,532)	0
Settlements/ distributions	(635)	(2,876)	(1,042)	(4,777)
Closing balance	119,925	120,778	119,925	120,778
Change in unrealized investment gains/(losses)	(13,821)	(4,307)	(13,073)	(1,816)
Other investments | CLO-Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	5,019	4,881	5,016	5,910
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	493	803	903	1,675
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ distributions	(635)	(876)	(1,042)	(2,777)
Closing balance	4,877	4,808	4,877	4,808
Change in unrealized investment gains/(losses)	493	803	903	1,675
Other investments | Other privately held investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	140,953	115,474	136,158	104,521
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(6,231)	(5,110)	(5,895)	(3,491)
Included in OCI	0	0	0	0
Purchases	14,858	7,606	19,317	16,940
Sales	(34,532)	0	(34,532)	0
Settlements/ distributions	0	(2,000)	0	(2,000)
Closing balance	115,048	115,970	115,048	115,970
Change in unrealized investment gains/(losses)	$ (14,314)	$ (5,110)	$ (13,976)	$ (3,491)

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