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INVESTMENTS (DETAILS 3)
$ in Thousands
Sep. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Fixed Maturities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater $ 1,345,204 $ 1,354,213
Unrealized Losses - 12 months or greater (101,177) (71,302)
Fair Value - Less than 12 months 4,255,646 4,801,110
Unrealized Losses - Less than 12 months (77,281) (101,936)
Total Fair Value of Securities in Unrealized Loss Position 5,600,850 6,155,323
Total Unrealized Losses $ (178,458) $ (173,238)
Number of Available For Sale Securities In Unrealized Loss Positions | security 1,712 1,388
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 390 223
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (27,000) $ (36,000)
US Government and Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 121,077 388,551
Unrealized Losses - 12 months or greater (8,479) (24,319)
Fair Value - Less than 12 months 582,387 786,850
Unrealized Losses - Less than 12 months (4,380) (4,009)
Total Fair Value of Securities in Unrealized Loss Position 703,464 1,175,401
Total Unrealized Losses (12,859) (28,328)
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 137,816 143,602
Unrealized Losses - 12 months or greater (46,343) (29,171)
Fair Value - Less than 12 months 269,400 435,670
Unrealized Losses - Less than 12 months (20,796) (25,270)
Total Fair Value of Securities in Unrealized Loss Position 407,216 579,272
Total Unrealized Losses (67,139) (54,441)
Corporate Debt [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 368,525 26,708
Unrealized Losses - 12 months or greater (34,296) (2,221)
Fair Value - Less than 12 months 2,056,431 2,199,672
Unrealized Losses - Less than 12 months (43,247) (64,059)
Total Fair Value of Securities in Unrealized Loss Position 2,424,956 2,226,380
Total Unrealized Losses (77,543) (66,280)
Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 67,859 259,914
Unrealized Losses - 12 months or greater (1,063) (3,084)
Fair Value - Less than 12 months 493,436 333,288
Unrealized Losses - Less than 12 months (2,250) (1,151)
Total Fair Value of Securities in Unrealized Loss Position 561,295 593,202
Total Unrealized Losses (3,313) (4,235)
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 75,560 68,624
Unrealized Losses - 12 months or greater (971) (925)
Fair Value - Less than 12 months 271,340 256,225
Unrealized Losses - Less than 12 months (2,680) (1,094)
Total Fair Value of Securities in Unrealized Loss Position 346,900 324,849
Total Unrealized Losses (3,651) (2,019)
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 6,294 6,689
Unrealized Losses - 12 months or greater (675) (613)
Fair Value - Less than 12 months 59,911 13,442
Unrealized Losses - Less than 12 months (781) (302)
Total Fair Value of Securities in Unrealized Loss Position 66,205 20,131
Total Unrealized Losses (1,456) (915)
ABS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 553,123 425,663
Unrealized Losses - 12 months or greater (8,703) (10,325)
Fair Value - Less than 12 months 489,771 750,679
Unrealized Losses - Less than 12 months (2,748) (5,863)
Total Fair Value of Securities in Unrealized Loss Position 1,042,894 1,176,342
Total Unrealized Losses (11,451) (16,188)
Municipals [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 14,950 34,462
Unrealized Losses - 12 months or greater (647) (644)
Fair Value - Less than 12 months 32,970 25,284
Unrealized Losses - Less than 12 months (399) (188)
Total Fair Value of Securities in Unrealized Loss Position 47,920 59,746
Total Unrealized Losses (1,046) (832)
Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 25,984 0
Unrealized Losses - 12 months or greater (4,141) 0
Fair Value - Less than 12 months 403,147 204,092
Unrealized Losses - Less than 12 months (13,999) (7,524)
Total Fair Value of Securities in Unrealized Loss Position 429,131 204,092
Total Unrealized Losses $ (18,140) $ (7,524)
Number of Available For Sale Securities In Unrealized Loss Positions | security 36 9
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 1 0
Exchange-Traded Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater $ 25,984 $ 0
Unrealized Losses - 12 months or greater (4,141) 0
Fair Value - Less than 12 months 281,414 91,275
Unrealized Losses - Less than 12 months (13,563) (4,756)
Total Fair Value of Securities in Unrealized Loss Position 307,398 91,275
Total Unrealized Losses (17,704) (4,756)
Bond Mutual 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 121,733 112,817
Unrealized Losses - Less than 12 months (436) (2,768)
Total Fair Value of Securities in Unrealized Loss Position 121,733 112,817
Total Unrealized Losses $ (436) $ (2,768)