FAIR VALUE MEASUREMENTS (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Liabilities)	$ 6,500	$ 10,937
Transfers into Level 3 (Liabilities)	0	0
Transfers out of Level 3 (Liabilities)	0	0
Included in earnings (Liabilities)	8,686	3,423
Included in OCI (Liabilities)	0	0
Purchases (Liabilities)	0	(1,025)
Sales (Liabilities)	0	0
Settlements/ Distributions (Liabilities)	1,435	1,693
Closing Balance (Liabilities)	16,621	15,028
Change in unrealized investment gain/loss relating to assets held at the reporting date (Liabilities)	7,335	3,682
Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	96,400	49,440
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	(18,948)	(1,955)
Included in earnings (Assets)	58	2
Included in OCI (Assets)	1,434	(220)
Purchases (Assets)	15,364	5,821
Sales (Assets)	(15,720)	(1,910)
Settlements/ Distributions (Assets)	(4,987)	(377)
Closing Balance (Assets)	73,601	50,801
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0
Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	102,842	27,257
Transfers into Level 3 (Assets)	0	36,378
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	1,265	(1,016)
Included in OCI (Assets)	0	0
Purchases (Assets)	0	36,712
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	(7,337)	(2,248)
Closing Balance (Assets)	96,770	97,083
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	1,265	(1,016)
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	27,555	29,320
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	758	2,939
Included in OCI (Assets)	0	0
Purchases (Assets)	0	38,071
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	(90)	(2,725)
Closing Balance (Assets)	28,223	67,605
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	758	1,470
Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	226,797	106,017
Transfers into Level 3 (Assets)	0	36,378
Transfers out of Level 3 (Assets)	(18,948)	(1,955)
Included in earnings (Assets)	2,081	1,925
Included in OCI (Assets)	1,434	(220)
Purchases (Assets)	15,364	43,892
Sales (Assets)	(15,720)	(1,910)
Settlements/ Distributions (Assets)	(12,414)	(5,350)
Closing Balance (Assets)	198,594	178,777
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	2,023	454
Corporate Debt [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	75,875	38,518
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	(1,955)
Included in earnings (Assets)	58	2
Included in OCI (Assets)	(47)	(76)
Purchases (Assets)	5,964	5,821
Sales (Assets)	(15,720)	(1,910)
Settlements/ Distributions (Assets)	(2,342)	(150)
Closing Balance (Assets)	63,788	40,250
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0
CMBS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	3,061	10,922
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	0	0
Included in OCI (Assets)	(3)	(144)
Purchases (Assets)	9,400	0
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	(2,645)	(227)
Closing Balance (Assets)	9,813	10,551
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	0	0
ABS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	17,464	0
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	(18,948)	0
Included in earnings (Assets)	0	0
Included in OCI (Assets)	1,484	0
Purchases (Assets)	0	0
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	0	0
Closing Balance (Assets)	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	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)	42,142	0
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	236	0
Included in OCI (Assets)	0	0
Purchases (Assets)	0	36,712
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	0	0
Closing Balance (Assets)	42,378	36,712
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	236	0
CLO-Equities [Member] | Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	60,700	27,257
Transfers into Level 3 (Assets)	0	36,378
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	1,029	(1,016)
Included in OCI (Assets)	0	0
Purchases (Assets)	0	0
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	(7,337)	(2,248)
Closing Balance (Assets)	54,392	60,371
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	1,029	(1,016)
Derivative [Member] | Other Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Liabilities)	6,500	10,937
Transfers into Level 3 (Liabilities)	0	0
Transfers out of Level 3 (Liabilities)	0	0
Included in earnings (Liabilities)	8,686	3,423
Included in OCI (Liabilities)	0	0
Purchases (Liabilities)	0	(1,025)
Sales (Liabilities)	0	0
Settlements/ Distributions (Liabilities)	1,435	1,693
Closing Balance (Liabilities)	16,621	15,028
Change in unrealized investment gain/loss relating to assets held at the reporting date (Liabilities)	7,335	3,682
Derivative [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	2,532	4,395
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	755	2,948
Included in OCI (Assets)	0	0
Purchases (Assets)	0	1,359
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	(90)	(2,725)
Closing Balance (Assets)	3,197	5,977
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	755	1,479
Insurance-linked securities [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance (Assets)	25,023	24,925
Transfers into Level 3 (Assets)	0	0
Transfers out of Level 3 (Assets)	0	0
Included in earnings (Assets)	3	(9)
Included in OCI (Assets)	0	0
Purchases (Assets)	0	0
Sales (Assets)	0	0
Settlements/ Distributions (Assets)	0	0
Closing Balance (Assets)	25,026	24,916
Change in unrealized investment gain/loss relating to assets held at the reporting date (Assets)	$ 3	$ (9)