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INVESTMENTS (DETAILS 3)
$ in Thousands
Jun. 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 $ 1,166,777 $ 1,354,213
Unrealized Losses - 12 months or greater (81,159) (71,302)
Fair Value - Less than 12 months 5,097,880 4,801,110
Unrealized Losses - Less than 12 months (98,013) (101,936)
Total Fair Value of Securities in Unrealized Loss Position 6,264,657 6,155,323
Total Unrealized Losses $ (179,172) $ (173,238)
Number of Available For Sale Securities In Unrealized Loss Positions | security 1,525 1,388
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 285 223
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (19,000) $ (36,000)
US Government and Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 128,916 388,551
Unrealized Losses - 12 months or greater (6,688) (24,319)
Fair Value - Less than 12 months 881,631 786,850
Unrealized Losses - Less than 12 months (13,760) (4,009)
Total Fair Value of Securities in Unrealized Loss Position 1,010,547 1,175,401
Total Unrealized Losses (20,448) (28,328)
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 163,690 143,602
Unrealized Losses - 12 months or greater (46,219) (29,171)
Fair Value - Less than 12 months 298,542 435,670
Unrealized Losses - Less than 12 months (17,781) (25,270)
Total Fair Value of Securities in Unrealized Loss Position 462,232 579,272
Total Unrealized Losses (64,000) (54,441)
Corporate Debt [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 229,078 26,708
Unrealized Losses - 12 months or greater (19,633) (2,221)
Fair Value - Less than 12 months 2,326,826 2,199,672
Unrealized Losses - Less than 12 months (52,775) (64,059)
Total Fair Value of Securities in Unrealized Loss Position 2,555,904 2,226,380
Total Unrealized Losses (72,408) (66,280)
Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 65,726 259,914
Unrealized Losses - 12 months or greater (1,740) (3,084)
Fair Value - Less than 12 months 763,509 333,288
Unrealized Losses - Less than 12 months (7,539) (1,151)
Total Fair Value of Securities in Unrealized Loss Position 829,235 593,202
Total Unrealized Losses (9,279) (4,235)
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 64,037 68,624
Unrealized Losses - 12 months or greater (784) (925)
Fair Value - Less than 12 months 297,266 256,225
Unrealized Losses - Less than 12 months (3,072) (1,094)
Total Fair Value of Securities in Unrealized Loss Position 361,303 324,849
Total Unrealized Losses (3,856) (2,019)
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 4,963 6,689
Unrealized Losses - 12 months or greater (600) (613)
Fair Value - Less than 12 months 44,753 13,442
Unrealized Losses - Less than 12 months (383) (302)
Total Fair Value of Securities in Unrealized Loss Position 49,716 20,131
Total Unrealized Losses (983) (915)
ABS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 495,889 425,663
Unrealized Losses - 12 months or greater (5,090) (10,325)
Fair Value - Less than 12 months 336,672 750,679
Unrealized Losses - Less than 12 months (888) (5,863)
Total Fair Value of Securities in Unrealized Loss Position 832,561 1,176,342
Total Unrealized Losses (5,978) (16,188)
Municipals [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 14,478 34,462
Unrealized Losses - 12 months or greater (405) (644)
Fair Value - Less than 12 months 148,681 25,284
Unrealized Losses - Less than 12 months (1,815) (188)
Total Fair Value of Securities in Unrealized Loss Position 163,159 59,746
Total Unrealized Losses (2,220) (832)
Equity Securities [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 131,718 204,092
Unrealized Losses - Less than 12 months (3,841) (7,524)
Total Fair Value of Securities in Unrealized Loss Position 131,718 204,092
Total Unrealized Losses $ (3,841) $ (7,524)
Number of Available For Sale Securities In Unrealized Loss Positions | security 38 9
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 0 0
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 115,026 91,275
Unrealized Losses - Less than 12 months (3,763) (4,756)
Total Fair Value of Securities in Unrealized Loss Position 115,026 91,275
Total Unrealized Losses (3,763) (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 16,692 112,817
Unrealized Losses - Less than 12 months (78) (2,768)
Total Fair Value of Securities in Unrealized Loss Position 16,692 112,817
Total Unrealized Losses $ (78) $ (2,768)