FAIR VALUE MEASUREMENTS (DETAILS 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fixed Maturities [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	$ 34,693	$ 280,649	$ 34,817	$ 70,931
Transfers into Level 3	0	0	128	8,382
Transfers out of Level 3	0	(214,435)	0	(214,435)
Included in earnings	0	0	0	1,438
Included in OCI	250	547	135	969
Purchases	0	0	0	212,889
Sales	0	0	0	(13,290)
Settlements / distributions	(127)	(851)	(264)	(974)
Balance at end of period	34,816	65,910	34,816	65,910
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	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	576,848	481,407	557,055	422,431
Transfers into Level 3	0	29,953	0	29,953
Transfers out of Level 3	0	0	0	0
Included in earnings	18,294	12,034	33,173	40,515
Included in OCI	0	0	0	0
Purchases	16,722	1,796	37,512	54,232
Sales	0	0	0	0
Settlements / distributions	(10,483)	(23,694)	(26,359)	(45,635)
Balance at end of period	601,381	501,496	601,381	501,496
Change in unrealized investment gain/loss relating to assets held at the reporting date	18,294	12,034	33,173	40,515
Other Assets [Member]
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Balance at beginning of period	1,707	0	984	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	293	0	5,011	0
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements / distributions	(2,000)	0	(5,995)	0
Balance at end of period	0	0	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	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	613,248	762,056	592,856	493,362
Transfers into Level 3	0	29,953	128	38,335
Transfers out of Level 3	0	(214,435)	0	(214,435)
Included in earnings	18,587	12,034	38,184	41,953
Included in OCI	250	547	135	969
Purchases	16,722	1,796	37,512	267,121
Sales	0	0	0	(13,290)
Settlements / distributions	(12,610)	(24,545)	(32,618)	(46,609)
Balance at end of period	636,197	567,406	636,197	567,406
Change in unrealized investment gain/loss relating to assets held at the reporting date	18,294	12,034	33,173	40,515
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	815	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	(90)	0	896	0
Included in OCI	0	0	0	0
Purchases	840	0	840	0
Sales	0	0	0	0
Settlements / distributions	0	0	(1,801)	0
Balance at end of period	750	0	750	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	(90)	0	(90)	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	0	0	0	1,550
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	0	0	0	1,550
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	(3,100)
Settlements / distributions	0	0	0	0
Balance at end of period	0	0	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	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	0	1,300	0	1,110
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(1,223)	0	(1,223)
Included in earnings	0	0	0	0
Included in OCI	0	(77)	0	135
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements / distributions	0	0	0	(22)
Balance at end of period	0	0	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	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	3,969	12,600	4,018	4,296
Transfers into Level 3	0	0	0	8,382
Transfers out of Level 3	0	0	0	0
Included in earnings	0	0	0	0
Included in OCI	(23)	(69)	(43)	(147)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements / distributions	(13)	(746)	(42)	(746)
Balance at end of period	3,933	11,785	3,933	11,785
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	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	30,724	266,749	30,799	63,975
Transfers into Level 3	0	0	128	0
Transfers out of Level 3	0	(213,212)	0	(213,212)
Included in earnings	0	0	0	(112)
Included in OCI	273	693	178	981
Purchases	0	0	0	212,889
Sales	0	0	0	(10,190)
Settlements / distributions	(114)	(105)	(222)	(206)
Balance at end of period	30,883	54,125	30,883	54,125
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	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	464,666	414,716	461,055	359,996
Transfers into Level 3	0	29,953	0	29,953
Transfers out of Level 3	0	0	0	0
Included in earnings	12,746	6,962	20,923	25,490
Included in OCI	0	0	0	0
Purchases	3,000	0	7,500	50,000
Sales	0	0	0	0
Settlements / distributions	(3,604)	(7,411)	(12,670)	(21,219)
Balance at end of period	476,808	444,220	476,808	444,220
Change in unrealized investment gain/loss relating to assets held at the reporting date	12,746	6,962	20,923	25,490
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	26,003	2,436	22,134	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	367	0	919	0
Included in OCI	0	0	0	0
Purchases	7,300	1,796	10,745	4,232
Sales	0	0	0	0
Settlements / distributions	(203)	0	(331)	0
Balance at end of period	33,467	4,232	33,467	4,232
Change in unrealized investment gain/loss relating to assets held at the reporting date	367	0	919	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	86,179	64,255	73,866	62,435
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	5,181	5,072	11,331	15,025
Included in OCI	0	0	0	0
Purchases	6,422	0	19,267	0
Sales	0	0	0	0
Settlements / distributions	(6,676)	(16,283)	(13,358)	(24,416)
Balance at end of period	91,106	53,044	91,106	53,044
Change in unrealized investment gain/loss relating to assets held at the reporting date	5,181	5,072	11,331	15,025
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	1,707	0	984	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	293	0	5,011	0
Included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements / distributions	(2,000)	0	(5,995)	0
Balance at end of period	0	0	0	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	0	0	0	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	815	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Included in earnings	(90)	0	896	0
Included in OCI	0	0	0	0
Purchases	840	0	840	0
Sales	0	0	0	0
Settlements / distributions	0	0	(1,801)	0
Balance at end of period	750	0	750	0
Change in unrealized investment gain/loss relating to assets held at the reporting date	$ (90)	$ 0	$ (90)	$ 0