FAIR VALUE MEASUREMENTS (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Liabilities)	$ 12,209	$ 1,978	$ 6,500	$ 10,937
Transfers into Level 3 (Liabilities)	0	0	0	0
Transfers out of Level 3 (Liabilities)	0	0	0	0
Included in earnings (Liabilities)	(291)	(169)	9,991	2,445
Included in OCI (Liabilities)	0	0	0	0
Purchases (Liabilities)	0	6,384	12,135	7,189
Sales (Liabilities)	0	0	0	0
Settlements/ Distributions (Liabilities)	(74)	(9)	(16,782)	(12,387)
Closing Balance (Liabilities)	11,844	8,184	11,844	8,184
Change in unrealized investment gain/loss relating to assets held at the reporting date (Liabilities)	(291)	335	(291)	457
Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	189,380	204,900	226,797	106,017
Transfers into Level 3 (Assets)	0	0	1,536	56,790
Transfers out of Level 3 (Assets)	(7,209)	0	(37,479)	(1,955)
Included in earnings (Assets)	956	8,978	5,030	18,551
Included in OCI (Assets)	1	52	1,118	1,054
Purchases (Assets)	24,007	10,881	58,588	65,135
Sales (Assets)	(2,274)	0	(21,475)	(4,015)
Settlements/ Distributions (Assets)	(14,674)	(12,345)	(43,928)	(29,111)
Closing Balance (Assets)	190,187	212,466	190,187	212,466
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	1,791	8,987	5,139	16,953
Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	74,319	72,232	96,400	49,440
Transfers into Level 3 (Assets)	0	0	1,536	20,412
Transfers out of Level 3 (Assets)	(7,209)	0	(37,479)	(1,955)
Included in earnings (Assets)	(835)	(9)	(762)	(988)
Included in OCI (Assets)	1	52	1,118	1,054
Purchases (Assets)	24,007	7,563	58,588	17,107
Sales (Assets)	(2,274)	0	(21,475)	(4,015)
Settlements/ Distributions (Assets)	(2,978)	(1,826)	(12,895)	(3,043)
Closing Balance (Assets)	85,031	78,012	85,031	78,012
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0	0	0
Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	90,014	107,638	102,842	27,257
Transfers into Level 3 (Assets)	0	0	0	36,378
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	1,862	8,064	5,186	15,926
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	1,500	0	44,405
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	(11,696)	(10,519)	(27,848)	(17,283)
Closing Balance (Assets)	80,180	106,683	80,180	106,683
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	1,862	8,064	5,186	15,926
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	25,047	25,030	27,555	29,320
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	(71)	923	606	3,613
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	1,818	0	3,623
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	0	(3,185)	(8,785)
Closing Balance (Assets)	24,976	27,771	24,976	27,771
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	(71)	923	(47)	1,027
Corporate Debt [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	68,320	62,022	75,875	38,518
Transfers into Level 3 (Assets)	0	0	1,536	20,412
Transfers out of Level 3 (Assets)	(1,208)	0	(3,112)	(1,955)
Included in earnings (Assets)	(835)	(9)	(762)	(988)
Included in OCI (Assets)	(9)	100	(392)	1,188
Purchases (Assets)	0	7,563	19,181	17,107
Sales (Assets)	(2,274)	0	(21,475)	(4,015)
Settlements/ Distributions (Assets)	(2,978)	(584)	(9,835)	(1,175)
Closing Balance (Assets)	61,016	69,092	61,016	69,092
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0	0	0
CMBS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	0	10,210	3,061	10,922
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	0	0	(9,418)	0
Included in earnings (Assets)	0	0	0	0
Included in OCI (Assets)	0	(48)	17	(134)
Purchases (Assets)	0	0	9,400	0
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	(1,242)	(3,060)	(1,868)
Closing Balance (Assets)	0	8,920	0	8,920
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0	0	0
ABS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	5,999	0	17,464	0
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	(6,001)	0	(24,949)	0
Included in earnings (Assets)	0	0	0	0
Included in OCI (Assets)	10	0	1,493	0
Purchases (Assets)	24,007	0	30,007	0
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	0	0	0
Closing Balance (Assets)	24,015	0	24,015	0
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0	0	0
Other Privately Held Investments [Member] | Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	42,938	41,755	42,142	0
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	460	(355)	1,256	(1,505)
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	1,500	0	44,405
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	0	0	0
Closing Balance (Assets)	43,398	42,900	43,398	42,900
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	460	(355)	1,256	(1,505)
CLO-Equities [Member] | Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	47,076	65,883	60,700	27,257
Transfers into Level 3 (Assets)	0	0	0	36,378
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	1,402	8,419	3,930	17,431
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	0	0	0
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	(11,696)	(10,519)	(27,848)	(17,283)
Closing Balance (Assets)	36,782	63,783	36,782	63,783
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	1,402	8,419	3,930	17,431
Derivative [Member] | Other Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Liabilities)	12,209	1,978	6,500	10,937
Transfers into Level 3 (Liabilities)	0	0	0	0
Transfers out of Level 3 (Liabilities)	0	0	0	0
Included in earnings (Liabilities)	(291)	(169)	9,991	2,445
Included in OCI (Liabilities)	0	0	0	0
Purchases (Liabilities)	0	6,384	12,135	7,189
Sales (Liabilities)	0	0	0	0
Settlements/ Distributions (Liabilities)	(74)	(9)	(16,782)	(12,387)
Closing Balance (Liabilities)	11,844	8,184	11,844	8,184
Change in unrealized investment gain/loss relating to assets held at the reporting date (Liabilities)	(291)	335	(291)	457
Derivative [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	0	5	2,532	4,395
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	0	665	653	3,255
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	1,818	0	3,623
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	0	(3,185)	(8,785)
Closing Balance (Assets)	0	2,488	0	2,488
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	665	0	669
Insurance-linked securities [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	25,047	25,025	25,023	24,925
Transfers into Level 3 (Assets)	0	0	0	0
Transfers out of Level 3 (Assets)	0	0	0	0
Included in earnings (Assets)	(71)	258	(47)	358
Included in OCI (Assets)	0	0	0	0
Purchases (Assets)	0	0	0	0
Sales (Assets)	0	0	0	0
Settlements/ Distributions (Assets)	0	0	0	0
Closing Balance (Assets)	24,976	25,283	24,976	25,283
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	$ (71)	$ 258	$ (47)	$ 358