INVESTMENTS (DETAILS 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014 security	Dec. 31, 2013 security
Fixed Maturities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	$ 1,512,461	$ 271,520
Unrealized Losses - 12 months or greater	(53,590)	(13,466)
Fair Value - Less than 12 months	1,462,289	4,889,507
Unrealized Losses - Less than 12 months	(6,997)	(166,571)
Total Fair Value of Securities in Unrealized Loss Position	2,974,750	5,161,027
Total Unrealized Losses	(60,587)	(180,037)
Number of Available For Sale Securities In Unrealized Loss Positions	687	1,127
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater	317	99
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
Schedule Of Available For Sale Securities [Line Items]
Total Unrealized Losses	(2,000)	(2,000)
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	400,317	0
Unrealized Losses - 12 months or greater	(13,879)	0
Fair Value - Less than 12 months	242,865	982,307
Unrealized Losses - Less than 12 months	(130)	(33,952)
Total Fair Value of Securities in Unrealized Loss Position	643,182	982,307
Total Unrealized Losses	(14,009)	(33,952)
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	186,998	35,577
Unrealized Losses - 12 months or greater	(20,060)	(3,430)
Fair Value - Less than 12 months	133,205	420,622
Unrealized Losses - Less than 12 months	(1,230)	(46,562)
Total Fair Value of Securities in Unrealized Loss Position	320,203	456,199
Total Unrealized Losses	(21,290)	(49,992)
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	62,552	27,696
Unrealized Losses - 12 months or greater	(2,713)	(802)
Fair Value - Less than 12 months	539,287	606,592
Unrealized Losses - Less than 12 months	(2,629)	(9,426)
Total Fair Value of Securities in Unrealized Loss Position	601,839	634,288
Total Unrealized Losses	(5,342)	(10,228)
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	366,449	144,468
Unrealized Losses - 12 months or greater	(8,547)	(5,247)
Fair Value - Less than 12 months	101,488	1,478,527
Unrealized Losses - Less than 12 months	(531)	(53,044)
Total Fair Value of Securities in Unrealized Loss Position	467,937	1,622,995
Total Unrealized Losses	(9,078)	(58,291)
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	82,434	13,319
Unrealized Losses - 12 months or greater	(638)	(116)
Fair Value - Less than 12 months	24,935	298,863
Unrealized Losses - Less than 12 months	(149)	(3,850)
Total Fair Value of Securities in Unrealized Loss Position	107,369	312,182
Total Unrealized Losses	(787)	(3,966)
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	8,884	4,287
Unrealized Losses - 12 months or greater	(366)	(315)
Fair Value - Less than 12 months	215	5,319
Unrealized Losses - Less than 12 months	0	(83)
Total Fair Value of Securities in Unrealized Loss Position	9,099	9,606
Total Unrealized Losses	(366)	(398)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	309,814	37,765
Unrealized Losses - 12 months or greater	(5,670)	(2,941)
Fair Value - Less than 12 months	372,067	553,803
Unrealized Losses - Less than 12 months	(2,122)	(5,753)
Total Fair Value of Securities in Unrealized Loss Position	681,881	591,568
Total Unrealized Losses	(7,792)	(8,694)
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	95,013	8,408
Unrealized Losses - 12 months or greater	(1,717)	(615)
Fair Value - Less than 12 months	48,227	543,474
Unrealized Losses - Less than 12 months	(206)	(13,901)
Total Fair Value of Securities in Unrealized Loss Position	143,240	551,882
Total Unrealized Losses	(1,923)	(14,516)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	9,909	3,499
Unrealized Losses - 12 months or greater	(1,339)	(398)
Fair Value - Less than 12 months	44,822	48,828
Unrealized Losses - Less than 12 months	(1,801)	(5,785)
Total Fair Value of Securities in Unrealized Loss Position	54,731	52,327
Total Unrealized Losses	(3,140)	(6,183)
Number of Available For Sale Securities In Unrealized Loss Positions	58	63
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater	10	9
Common Stock [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	9,909	3,499
Unrealized Losses - 12 months or greater	(1,339)	(398)
Fair Value - Less than 12 months	44,822	48,828
Unrealized Losses - Less than 12 months	(1,801)	(5,785)
Total Fair Value of Securities in Unrealized Loss Position	54,731	52,327
Total Unrealized Losses	$ (3,140)	$ (6,183)