FAIR VALUE MEASUREMENTS (DETAILS 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	$ 70,931	$ 50,878
Transfers into Level 3	0	15,945
Transfers out of Level 3	(1,222)	0
Included in earnings	1,439	0
Included in OCI	1,651	5,112
Purchases	0	0
Sales	0	0
Settlements / distributions	(37,982)	(1,004)
Balance at end of period	34,817	70,931
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
Other Investments [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	422,431	412,804
Transfers into Level 3	0	0
Transfers out of Level 3	0	(9,435)
Included in earnings	86,066	64,409
Included in OCI	0	0
Purchases	142,471	0
Sales	0	(2,835)
Settlements / distributions	(93,913)	(42,512)
Balance at end of period	557,055	422,431
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	86,066	64,409
Other Assets [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	2,084	0
Included in OCI	0	0
Purchases	(1,100)	0
Sales	0	0
Settlements / distributions	0	0
Balance at end of period	984	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	2,084	0
Total Assets [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	493,362	463,682
Transfers into Level 3	0	15,945
Transfers out of Level 3	(1,222)	(9,435)
Included in earnings	89,589	64,409
Included in OCI	1,651	5,112
Purchases	141,371	0
Sales	0	(2,835)
Settlements / distributions	(131,895)	(43,516)
Balance at end of period	592,856	493,362
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	88,150	64,409
Total Liabilities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	98	0
Included in OCI	0	0
Purchases	717	0
Sales	0	0
Settlements / distributions	0	0
Balance at end of period	815	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	98	0
Corporate Debt [Member] | Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	1,550	1,550
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	1,550	0
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements / distributions	(3,100)	0
Balance at end of period	0	1,550
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
Non-Agency RMBS [Member] | Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	1,110	0
Transfers into Level 3	0	1,110
Transfers out of Level 3	(1,222)	0
Included in earnings	0	0
Included in OCI	135	0
Purchases	0	0
Sales	0	0
Settlements / distributions	(23)	0
Balance at end of period	0	1,110
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
CMBS [Member] | Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	4,296	0
Transfers into Level 3	0	4,296
Transfers out of Level 3	0	0
Included in earnings	0	0
Included in OCI	(278)	0
Purchases	0	0
Sales	0	0
Settlements / distributions	0	0
Balance at end of period	4,018	4,296
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
ABS [Member] | Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	63,975	49,328
Transfers into Level 3	0	10,539
Transfers out of Level 3	0	0
Included in earnings	(111)	0
Included in OCI	1,794	5,112
Purchases	0	0
Sales	0	0
Settlements / distributions	(34,859)	(1,004)
Balance at end of period	30,799	63,975
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
Hedge funds [Member] | Other Investments [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	359,996	346,244
Transfers into Level 3	0	0
Transfers out of Level 3	0	(9,435)
Included in earnings	58,293	33,301
Included in OCI	0	0
Purchases	86,138	0
Sales	0	(2,835)
Settlements / distributions	(43,372)	(7,279)
Balance at end of period	461,055	359,996
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	58,293	33,301
Direct Lending Funds [Member] | Other Investments [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(125)	0
Included in OCI	0	0
Purchases	22,317	0
Sales	0	0
Settlements / distributions	(58)	0
Balance at end of period	22,134	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	(125)	0
CLO-Equities [Member] | Other Investments [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	62,435	66,560
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	27,898	31,108
Included in OCI	0	0
Purchases	34,016	0
Sales	0	0
Settlements / distributions	(50,483)	(35,233)
Balance at end of period	73,866	62,435
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	27,898	31,108
Derivative [Member] | Other Assets [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	2,084	0
Included in OCI	0	0
Purchases	(1,100)	0
Sales	0	0
Settlements / distributions	0	0
Balance at end of period	984	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	2,084	0
Derivative [Member] | Other Liabilities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	98	0
Included in OCI	0	0
Purchases	717	0
Sales	0	0
Settlements / distributions	0	0
Balance at end of period	815	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	$ 98	$ 0