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INVESTMENTS (DETAILS 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
security
Dec. 31, 2013
security
Fixed Maturities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater $ 1,416,300 $ 271,520
Unrealized Losses - 12 months or greater (72,037) (13,466)
Fair Value - Less than 12 months 4,697,191 4,889,507
Unrealized Losses - Less than 12 months (65,932) (166,571)
Total Fair Value of Securities in Unrealized Loss Position 6,113,491 5,161,027
Total Unrealized Losses (137,969) (180,037)
Number of Available For Sale Securities In Unrealized Loss Positions 1,306 1,127
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 281 99
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses (14,000) (2,000)
US Government and Agency [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 392,084 0
Unrealized Losses - 12 months or greater (23,150) 0
Fair Value - Less than 12 months 864,003 982,307
Unrealized Losses - Less than 12 months (4,274) (33,952)
Total Fair Value of Securities in Unrealized Loss Position 1,256,087 982,307
Total Unrealized Losses (27,424) (33,952)
Non-US Government [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 148,526 35,577
Unrealized Losses - 12 months or greater (25,903) (3,430)
Fair Value - Less than 12 months 395,307 420,622
Unrealized Losses - Less than 12 months (19,557) (46,562)
Total Fair Value of Securities in Unrealized Loss Position 543,833 456,199
Total Unrealized Losses (45,460) (49,992)
Corporate Debt [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 35,841 27,696
Unrealized Losses - 12 months or greater (2,608) (802)
Fair Value - Less than 12 months 2,006,740 606,592
Unrealized Losses - Less than 12 months (34,571) (9,426)
Total Fair Value of Securities in Unrealized Loss Position 2,042,581 634,288
Total Unrealized Losses (37,179) (10,228)
Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 335,687 144,468
Unrealized Losses - 12 months or greater (9,617) (5,247)
Fair Value - Less than 12 months 469,445 1,478,527
Unrealized Losses - Less than 12 months (1,954) (53,044)
Total Fair Value of Securities in Unrealized Loss Position 805,132 1,622,995
Total Unrealized Losses (11,571) (58,291)
CMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 77,827 13,319
Unrealized Losses - 12 months or greater (1,066) (116)
Fair Value - Less than 12 months 310,078 298,863
Unrealized Losses - Less than 12 months (1,763) (3,850)
Total Fair Value of Securities in Unrealized Loss Position 387,905 312,182
Total Unrealized Losses (2,829) (3,966)
Non-Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 8,217 4,287
Unrealized Losses - 12 months or greater (524) (315)
Fair Value - Less than 12 months 3,087 5,319
Unrealized Losses - Less than 12 months (64) (83)
Total Fair Value of Securities in Unrealized Loss Position 11,304 9,606
Total Unrealized Losses (588) (398)
ABS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 378,668 37,765
Unrealized Losses - 12 months or greater (8,122) (2,941)
Fair Value - Less than 12 months 640,305 553,803
Unrealized Losses - Less than 12 months (3,720) (5,753)
Total Fair Value of Securities in Unrealized Loss Position 1,018,973 591,568
Total Unrealized Losses (11,842) (8,694)
Municipals [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 39,450 8,408
Unrealized Losses - 12 months or greater (1,047) (615)
Fair Value - Less than 12 months 8,226 543,474
Unrealized Losses - Less than 12 months (29) (13,901)
Total Fair Value of Securities in Unrealized Loss Position 47,676 551,882
Total Unrealized Losses (1,076) (14,516)
Equity Securities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 1,828 3,499
Unrealized Losses - 12 months or greater (249) (398)
Fair Value - Less than 12 months 66,475 48,828
Unrealized Losses - Less than 12 months (1,448) (5,785)
Total Fair Value of Securities in Unrealized Loss Position 68,303 52,327
Total Unrealized Losses (1,697) (6,183)
Number of Available For Sale Securities In Unrealized Loss Positions 9 63
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 2 9
Common Stock [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 1,828 3,499
Unrealized Losses - 12 months or greater (249) (398)
Fair Value - Less than 12 months 10,401 48,828
Unrealized Losses - Less than 12 months (399) (5,785)
Total Fair Value of Securities in Unrealized Loss Position 12,229 52,327
Total Unrealized Losses (648) (6,183)
Exchange-Traded Funds [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 56,074 0
Unrealized Losses - Less than 12 months (1,049) 0
Total Fair Value of Securities in Unrealized Loss Position 56,074 0
Total Unrealized Losses $ (1,049) $ 0