INVESTMENTS (DETAILS 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 security	Dec. 31, 2012 security
Fixed Maturities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	$ 271,520	$ 268,311
Unrealized Losses - 12 months or greater	(13,466)	(12,405)
Fair Value - Less than 12 months	4,889,507	1,432,707
Unrealized Losses - Less than 12 months	(166,571)	(6,080)
Total Fair Value of Securities in Unrealized Loss Position	5,161,027	1,701,018
Total Unrealized Losses	(180,037)	(18,485)
Number of Available For Sale Securities In Unrealized Loss Positions	1,127	478
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater	99	146
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
Schedule Of Available For Sale Securities [Line Items]
Total Unrealized Losses	(2,000)	(3,000)
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	0	0
Unrealized Losses - 12 months or greater	0	0
Fair Value - Less than 12 months	982,307	119,730
Unrealized Losses - Less than 12 months	(33,952)	(119)
Total Fair Value of Securities in Unrealized Loss Position	982,307	119,730
Total Unrealized Losses	(33,952)	(119)
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	35,577	44,568
Unrealized Losses - 12 months or greater	(3,430)	(1,453)
Fair Value - Less than 12 months	420,622	153,134
Unrealized Losses - Less than 12 months	(46,562)	(748)
Total Fair Value of Securities in Unrealized Loss Position	456,199	197,702
Total Unrealized Losses	(49,992)	(2,201)
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	27,696	95,511
Unrealized Losses - 12 months or greater	(802)	(2,947)
Fair Value - Less than 12 months	606,592	451,651
Unrealized Losses - Less than 12 months	(9,426)	(2,945)
Total Fair Value of Securities in Unrealized Loss Position	634,288	547,162
Total Unrealized Losses	(10,228)	(5,892)
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	144,468	9,557
Unrealized Losses - 12 months or greater	(5,247)	(148)
Fair Value - Less than 12 months	1,478,527	521,400
Unrealized Losses - Less than 12 months	(53,044)	(1,522)
Total Fair Value of Securities in Unrealized Loss Position	1,622,995	530,957
Total Unrealized Losses	(58,291)	(1,670)
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	13,319	1,749
Unrealized Losses - 12 months or greater	(116)	(16)
Fair Value - Less than 12 months	298,863	69,615
Unrealized Losses - Less than 12 months	(3,850)	(110)
Total Fair Value of Securities in Unrealized Loss Position	312,182	71,364
Total Unrealized Losses	(3,966)	(126)
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	4,287	11,026
Unrealized Losses - 12 months or greater	(315)	(537)
Fair Value - Less than 12 months	5,319	115
Unrealized Losses - Less than 12 months	(83)	(33)
Total Fair Value of Securities in Unrealized Loss Position	9,606	11,141
Total Unrealized Losses	(398)	(570)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	37,765	99,514
Unrealized Losses - 12 months or greater	(2,941)	(7,034)
Fair Value - Less than 12 months	553,803	39,296
Unrealized Losses - Less than 12 months	(5,753)	(148)
Total Fair Value of Securities in Unrealized Loss Position	591,568	138,810
Total Unrealized Losses	(8,694)	(7,182)
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	8,408	6,386
Unrealized Losses - 12 months or greater	(615)	(270)
Fair Value - Less than 12 months	543,474	77,766
Unrealized Losses - Less than 12 months	(13,901)	(455)
Total Fair Value of Securities in Unrealized Loss Position	551,882	84,152
Total Unrealized Losses	(14,516)	(725)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	3,499	11,554
Unrealized Losses - 12 months or greater	(398)	(1,793)
Fair Value - Less than 12 months	48,828	95,697
Unrealized Losses - Less than 12 months	(5,785)	(5,605)
Total Fair Value of Securities in Unrealized Loss Position	52,327	107,251
Total Unrealized Losses	(6,183)	(7,398)
Number of Available For Sale Securities In Unrealized Loss Positions	63	106
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater	9	17
Common Stock [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	3,499	11,554
Unrealized Losses - 12 months or greater	(398)	(1,793)
Fair Value - Less than 12 months	48,828	95,697
Unrealized Losses - Less than 12 months	(5,785)	(5,605)
Total Fair Value of Securities in Unrealized Loss Position	52,327	107,251
Total Unrealized Losses	$ (6,183)	$ (7,398)