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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	$ 10,589	$ 12,209	$ 11,510	$ 6,500
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	(377)	(291)	(1,298)	9,991
Included in OCI	0	0	0	0
Purchases	0	0	0	12,135
Sales	0	0	0	0
Settlements/ Distributions	0	(74)	0	(16,782)
Closing Balance	10,212	11,844	10,212	11,844
Change in unrealized investment gain/loss relating to assets held at the reporting date	(377)	(291)	(1,298)	(291)
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	61,605	74,319	52,897	96,400
Transfers into Level 3	8,163	0	11,688	1,536
Transfers out of Level 3	(11,212)	(7,209)	(15,490)	(37,479)
Included in net income	(579)	(835)	(698)	(762)
Included in OCI	4,906	1	5,921	1,118
Purchases	13,871	24,007	34,171	58,588
Sales	(3,960)	(2,274)	(9,714)	(21,475)
Settlements/ Distributions	(5,266)	(2,978)	(11,247)	(12,895)
Closing Balance	67,528	85,031	67,528	85,031
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	73,766	90,014	77,843	102,842
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	1,811	1,862	6,067	5,186
Included in OCI	0	0	0	0
Purchases	0	0	3,111	0
Sales	0	0	(1,500)	0
Settlements/ Distributions	(3,924)	(11,696)	(13,868)	(27,848)
Closing Balance	71,653	80,180	71,653	80,180
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,811	1,862	6,067	5,186
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	25,047	25,090	27,555
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	0	(71)	(90)	606
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ Distributions	0	0	(25,000)	(3,185)
Closing Balance	0	24,976	0	24,976
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	(71)	0	(47)
Total assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	135,371	189,380	155,830	226,797
Transfers into Level 3	8,163	0	11,688	1,536
Transfers out of Level 3	(11,212)	(7,209)	(15,490)	(37,479)
Included in net income	1,232	956	5,279	5,030
Included in OCI	4,906	1	5,921	1,118
Purchases	13,871	24,007	37,282	58,588
Sales	(3,960)	(2,274)	(11,214)	(21,475)
Settlements/ Distributions	(9,190)	(14,674)	(50,115)	(43,928)
Closing Balance	139,181	190,187	139,181	190,187
Change in unrealized investment gain/loss relating to assets held at the reporting date	1,811	1,791	6,067	5,139
Corporate debt | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	42,553	68,320	52,897	75,875
Transfers into Level 3	1,346	0	2,935	1,536
Transfers out of Level 3	0	(1,208)	(4,279)	(3,112)
Included in net income	(579)	(835)	(698)	(762)
Included in OCI	4,962	(9)	5,977	(392)
Purchases	13,871	0	17,056	19,181
Sales	(3,960)	(2,274)	(9,714)	(21,475)
Settlements/ Distributions	(5,093)	(2,978)	(11,074)	(9,835)
Closing Balance	53,100	61,016	53,100	61,016
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	0
Non-Agency RMBS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	903		0	0
Transfers into Level 3	0		0	0
Transfers out of Level 3	(790)		(789)	0
Included in net income	0		0	0
Included in OCI	(1)		1	0
Purchases	0		900	0
Sales	0		0	0
Settlements/ Distributions	(112)		(112)	0
Closing Balance	0	0	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0		0	0
CMBS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	18,149	0	0	3,061
Transfers into Level 3	3,160	0	5,096	0
Transfers out of Level 3	(10,422)	0	(10,422)	(9,418)
Included in net income	0	0	0	0
Included in OCI	(55)	0	(57)	17
Purchases	0	0	16,215	9,400
Sales	0	0	0	0
Settlements/ Distributions	(61)	0	(61)	(3,060)
Closing Balance	10,771	0	10,771	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	0
ABS | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	5,999	0	17,464
Transfers into Level 3	3,657	0	3,657	0
Transfers out of Level 3	0	(6,001)	0	(24,949)
Included in net income	0	0	0	0
Included in OCI	0	10	0	1,493
Purchases	0	24,007	0	30,007
Sales	0	0	0	0
Settlements/ Distributions	0	0	0	0
Closing Balance	3,657	24,015	3,657	24,015
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	0
Other privately held investments | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	47,613	42,938	46,430	42,142
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	(224)	460	(652)	1,256
Included in OCI	0	0	0	0
Purchases	0	0	3,111	0
Sales	0	0	(1,500)	0
Settlements/ Distributions	0	0	0	0
Closing Balance	47,389	43,398	47,389	43,398
Change in unrealized investment gain/loss relating to assets held at the reporting date	(224)	460	(652)	1,256
CLO-Equities | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	26,153	47,076	31,413	60,700
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	2,035	1,402	6,719	3,930
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ Distributions	(3,924)	(11,696)	(13,868)	(27,848)
Closing Balance	24,264	36,782	24,264	36,782
Change in unrealized investment gain/loss relating to assets held at the reporting date	2,035	1,402	6,719	3,930
Derivative instruments | Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	10,589	12,209	11,510	6,500
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	(377)	(291)	(1,298)	9,991
Included in OCI	0	0	0	0
Purchases	0	0	0	12,135
Sales	0	0	0	0
Settlements/ Distributions	0	(74)	0	(16,782)
Closing Balance	10,212	11,844	10,212	11,844
Change in unrealized investment gain/loss relating to assets held at the reporting date	(377)	(291)	(1,298)	(291)
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 net income		0		653
Included in OCI		0		0
Purchases		0		0
Sales		0		0
Settlements/ Distributions		0		(3,185)
Closing Balance		0		0
Change in unrealized investment gain/loss relating to assets held at the reporting date		0		0
Insurance-linked securities | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	25,047	25,090	25,023
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in net income	0	(71)	(90)	(47)
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements/ Distributions	0	0	(25,000)	0
Closing Balance	0	24,976	0	24,976
Change in unrealized investment gain/loss relating to assets held at the reporting date	$ 0	$ (71)	$ 0	$ (47)

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