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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	$ 10,299	$ 11,510
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(66)	(568)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	10,233	10,942
Change in unrealized investment gain/loss relating to assets held at the reporting date	(66)	(568)
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	86,679	52,897
Transfers into Level 3	0	0
Transfers out of Level 3	(21,169)	(4,279)
Included in net income	(696)	(118)
Included in OCI	929	1,403
Purchases	9,750	0
Sales	(5,547)	(2,536)
Settlements/ distributions	(5,633)	(3,896)
Closing balance	64,313	43,471
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	65,789	77,843
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	1,082	2,362
Included in OCI	0	0
Purchases	2,500	3,111
Sales	0	(1,500)
Settlements/ distributions	(3,664)	(4,473)
Closing balance	65,707	77,343
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,082	2,362
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	25,090
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	(90)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	0	25,000
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	(90)
Total assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	152,468	155,830
Transfers into Level 3	0	0
Transfers out of Level 3	(21,169)	(4,279)
Included in net income	386	2,154
Included in OCI	929	1,403
Purchases	12,250	3,111
Sales	(5,547)	(4,036)
Settlements/ distributions	(9,297)	(8,369)
Closing balance	130,020	145,814
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,082	2,272
Corporate debt | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	49,012	52,897
Transfers into Level 3	0	0
Transfers out of Level 3	0	(4,279)
Included in net income	(696)	(118)
Included in OCI	624	1,403
Purchases	0	0
Sales	(5,547)	(2,536)
Settlements/ distributions	(2,268)	(3,896)
Closing balance	41,125	43,471
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
CMBS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	19,134	0
Transfers into Level 3	0	0
Transfers out of Level 3	(4,767)	0
Included in net income	0	0
Included in OCI	143	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	(3,365)	0
Closing balance	11,145	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
ABS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	18,533	0
Transfers into Level 3	0	0
Transfers out of Level 3	(16,402)	0
Included in net income	0	0
Included in OCI	162	0
Purchases	9,750	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	12,043	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0
Other privately held investments | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	44,518	46,430
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	667	746
Included in OCI	0	0
Purchases	2,500	3,111
Sales	0	(1,500)
Settlements/ distributions	0	0
Closing balance	47,685	48,787
Change in unrealized investment gain/loss relating to assets held at the reporting date	667	746
CLO-Equities | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	21,271	31,413
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	415	1,616
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	(3,664)	(4,473)
Closing balance	18,022	28,556
Change in unrealized investment gain/loss relating to assets held at the reporting date	415	1,616
Derivative instruments | Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	10,299	11,510
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(66)	(568)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	10,233	10,942
Change in unrealized investment gain/loss relating to assets held at the reporting date	(66)	(568)
Insurance-linked securities | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance	0	25,090
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	(90)
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ distributions	0	0
Closing balance	0	25,000
Change in unrealized investment gain/loss relating to assets held at the reporting date	$ 0	$ (90)

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