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INVESTMENTS (DETAILS 3)
$ in Thousands
Dec. 31, 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 $ 1,317,794 $ 1,354,213
Unrealized Losses - 12 months or greater (106,770) (71,302)
Fair Value - Less than 12 months 7,145,067 4,801,110
Unrealized Losses - Less than 12 months (123,638) (101,936)
Total Fair Value of Securities in Unrealized Loss Position 8,462,861 6,155,323
Total Unrealized Losses $ (230,408) $ (173,238)
Number of Available For Sale Securities In Unrealized Loss Positions | security 2,314 1,388
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 383 223
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (39,000) $ (36,000)
US Government and Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 84,179 388,551
Unrealized Losses - 12 months or greater (7,622) (24,319)
Fair Value - Less than 12 months 1,474,202 786,850
Unrealized Losses - Less than 12 months (15,591) (4,009)
Total Fair Value of Securities in Unrealized Loss Position 1,558,381 1,175,401
Total Unrealized Losses (23,213) (28,328)
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 170,269 143,602
Unrealized Losses - 12 months or greater (50,841) (29,171)
Fair Value - Less than 12 months 317,693 435,670
Unrealized Losses - Less than 12 months (21,491) (25,270)
Total Fair Value of Securities in Unrealized Loss Position 487,962 579,272
Total Unrealized Losses (72,332) (54,441)
Corporate Debt [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 340,831 26,708
Unrealized Losses - 12 months or greater (33,441) (2,221)
Fair Value - Less than 12 months 2,845,375 2,199,672
Unrealized Losses - Less than 12 months (62,845) (64,059)
Total Fair Value of Securities in Unrealized Loss Position 3,186,206 2,226,380
Total Unrealized Losses (96,286) (66,280)
Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 64,792 259,914
Unrealized Losses - 12 months or greater (1,609) (3,084)
Fair Value - Less than 12 months 1,073,566 333,288
Unrealized Losses - Less than 12 months (8,066) (1,151)
Total Fair Value of Securities in Unrealized Loss Position 1,138,358 593,202
Total Unrealized Losses (9,675) (4,235)
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 75,627 68,624
Unrealized Losses - 12 months or greater (1,579) (925)
Fair Value - Less than 12 months 659,480 256,225
Unrealized Losses - Less than 12 months (7,603) (1,094)
Total Fair Value of Securities in Unrealized Loss Position 735,107 324,849
Total Unrealized Losses (9,182) (2,019)
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 5,283 6,689
Unrealized Losses - 12 months or greater (210) (613)
Fair Value - Less than 12 months 43,199 13,442
Unrealized Losses - Less than 12 months (763) (302)
Total Fair Value of Securities in Unrealized Loss Position 48,482 20,131
Total Unrealized Losses (973) (915)
ABS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 562,599 425,663
Unrealized Losses - 12 months or greater (11,158) (10,325)
Fair Value - Less than 12 months 667,448 750,679
Unrealized Losses - Less than 12 months (6,443) (5,863)
Total Fair Value of Securities in Unrealized Loss Position 1,230,047 1,176,342
Total Unrealized Losses (17,601) (16,188)
Municipals [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 14,214 34,462
Unrealized Losses - 12 months or greater (310) (644)
Fair Value - Less than 12 months 64,104 25,284
Unrealized Losses - Less than 12 months (836) (188)
Total Fair Value of Securities in Unrealized Loss Position 78,318 59,746
Total Unrealized Losses (1,146) (832)
Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 2,331 0
Unrealized Losses - 12 months or greater (313) 0
Fair Value - Less than 12 months 234,997 204,092
Unrealized Losses - Less than 12 months (8,676) (7,524)
Total Fair Value of Securities in Unrealized Loss Position 237,328 204,092
Total Unrealized Losses $ (8,989) $ (7,524)
Number of Available For Sale Securities In Unrealized Loss Positions | security 35 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 $ 2,331 $ 0
Unrealized Losses - 12 months or greater (313) 0
Fair Value - Less than 12 months 110,972 91,275
Unrealized Losses - Less than 12 months (4,449) (4,756)
Total Fair Value of Securities in Unrealized Loss Position 113,303 91,275
Total Unrealized Losses (4,762) (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 124,025 112,817
Unrealized Losses - Less than 12 months (4,227) (2,768)
Total Fair Value of Securities in Unrealized Loss Position 124,025 112,817
Total Unrealized Losses $ (4,227) $ (2,768)