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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	$ 11,510	$ 6,500
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(568)	8,686
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	1,435
Closing Balance	10,942	16,621
Change in unrealized investment gain/loss relating to assets held at the reporting date	(568)	7,335
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	52,897	96,400
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	(18,948)
Included in earnings	(118)	58
Included in OCI	1,403	1,434
Purchases	0	15,364
Sales	(2,536)	(15,720)
Settlements/ Distributions	(3,896)	(4,987)
Closing Balance	43,471	73,601
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	77,843	102,842
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	2,362	1,265
Included in OCI	0	0
Purchases	3,111	0
Sales	(1,500)	0
Settlements/ Distributions	(4,473)	(7,337)
Closing Balance	77,343	96,770
Change in unrealized investment gain/loss relating to assets held at the reporting date	2,362	1,265
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	25,090	27,555
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(90)	758
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	(90)
Closing Balance	25,000	28,223
Change in unrealized investment gain/loss relating to assets held at the reporting date	(90)	758
Total assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	155,830	226,797
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	(18,948)
Included in earnings	2,154	2,081
Included in OCI	1,403	1,434
Purchases	3,111	15,364
Sales	(4,036)	(15,720)
Settlements/ Distributions	(8,369)	(12,414)
Closing Balance	145,814	198,594
Change in unrealized investment gain/loss relating to assets held at the reporting date	2,272	2,023
Corporate debt | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	52,897	75,875
Transfers into Level 3	0	0
Transfers out of Level 3	(4,279)	0
Included in earnings	(118)	58
Included in OCI	1,403	(47)
Purchases	0	5,964
Sales	(2,536)	(15,720)
Settlements/ Distributions	(3,896)	(2,342)
Closing Balance	43,471	63,788
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	0	3,061
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	0	0
Included in OCI	0	(3)
Purchases	0	9,400
Sales	0	0
Settlements/ Distributions	0	(2,645)
Closing Balance	0	9,813
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	0	17,464
Transfers into Level 3	0	0
Transfers out of Level 3	0	(18,948)
Included in earnings	0	0
Included in OCI	0	1,484
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	0	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	46,430	42,142
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	746	236
Included in OCI	0	0
Purchases	3,111	0
Sales	(1,500)	0
Settlements/ Distributions	0	0
Closing Balance	48,787	42,378
Change in unrealized investment gain/loss relating to assets held at the reporting date	746	236
CLO-Equities | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	31,413	60,700
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	1,616	1,029
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	(4,473)	(7,337)
Closing Balance	28,556	54,392
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,616	1,029
Derivative instruments | Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	11,510	6,500
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(568)	8,686
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	1,435
Closing Balance	10,942	16,621
Change in unrealized investment gain/loss relating to assets held at the reporting date	(568)	7,335
Derivative instruments | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	2,532
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	0	755
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	(90)
Closing Balance	0	3,197
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	755
Insurance-linked securities | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	25,090	25,023
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(90)	3
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	25,000	25,026
Change in unrealized investment gain/loss relating to assets held at the reporting date	$ (90)	$ 3

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