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INVESTMENTS (Gross Unrealized Losses) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
U.S. government and agency    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater $ 179,214 $ 194,916
Unrealized Losses - 12 months or greater (7,184) (5,963)
Fair Value - Less than 12 months 1,219,143 1,389,792
Unrealized Losses - Less than 12 months (18,710) (10,946)
Total Fair Value of Securities in Unrealized Loss Position 1,398,357 1,584,708
Total Unrealized Losses (25,894) (16,909)
Non-U.S. government    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 47,017 62,878
Unrealized Losses - 12 months or greater (4,693) (6,806)
Fair Value - Less than 12 months 214,545 204,110
Unrealized Losses - Less than 12 months (4,563) (2,717)
Total Fair Value of Securities in Unrealized Loss Position 261,562 266,988
Total Unrealized Losses (9,256) (9,523)
Corporate debt    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 335,415 407,300
Unrealized Losses - 12 months or greater (15,212) (11,800)
Fair Value - Less than 12 months 2,853,336 2,041,845
Unrealized Losses - Less than 12 months (55,870) (18,051)
Total Fair Value of Securities in Unrealized Loss Position 3,188,751 2,449,145
Total Unrealized Losses (71,082) (29,851)
Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 603,008 759,255
Unrealized Losses - 12 months or greater (24,241) (17,453)
Fair Value - Less than 12 months 1,011,088 1,172,313
Unrealized Losses - Less than 12 months (21,952) (10,247)
Total Fair Value of Securities in Unrealized Loss Position 1,614,096 1,931,568
Total Unrealized Losses (46,193) (27,700)
CMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 29,098 31,607
Unrealized Losses - 12 months or greater (1,272) (703)
Fair Value - Less than 12 months 684,264 348,943
Unrealized Losses - Less than 12 months (12,775) (2,422)
Total Fair Value of Securities in Unrealized Loss Position 713,362 380,550
Total Unrealized Losses (14,047) (3,125)
Non-Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 8,089 8,029
Unrealized Losses - 12 months or greater (453) (788)
Fair Value - Less than 12 months 108,548 4,197
Unrealized Losses - Less than 12 months (77) (11)
Total Fair Value of Securities in Unrealized Loss Position 116,637 12,226
Total Unrealized Losses (530) (799)
ABS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 43,804 57,298
Unrealized Losses - 12 months or greater (455) (570)
Fair Value - Less than 12 months 547,077 392,170
Unrealized Losses - Less than 12 months (4,263) (1,424)
Total Fair Value of Securities in Unrealized Loss Position 590,881 449,468
Total Unrealized Losses (4,718) (1,994)
Municipals    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 11,101 11,230
Unrealized Losses - 12 months or greater (375) (269)
Fair Value - Less than 12 months 93,140 65,632
Unrealized Losses - Less than 12 months (1,577) (703)
Total Fair Value of Securities in Unrealized Loss Position 104,241 76,862
Total Unrealized Losses (1,952) (972)
Fixed maturities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 1,256,746 1,532,513
Unrealized Losses - 12 months or greater (53,885) (44,352)
Fair Value - Less than 12 months 6,731,141 5,619,002
Unrealized Losses - Less than 12 months (119,787) (46,521)
Total Fair Value of Securities in Unrealized Loss Position 7,987,887 7,151,515
Total Unrealized Losses $ (173,672) $ (90,873)
Number of Available For Sale Securities In Unrealized Loss Positions | security 2,940 2,424
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security 555 627
Fixed maturities | Below Investment Grade or Not Rated    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (11,000) $ (7,000)
Common stocks    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater   0
Unrealized Losses - 12 months or greater   0
Fair Value - Less than 12 months   3,202
Unrealized Losses - Less than 12 months   (590)
Total Fair Value of Securities in Unrealized Loss Position   3,202
Total Unrealized Losses   (590)
Exchange-traded funds    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater   0
Unrealized Losses - 12 months or greater   0
Fair Value - Less than 12 months   12,323
Unrealized Losses - Less than 12 months   (294)
Total Fair Value of Securities in Unrealized Loss Position   12,323
Total Unrealized Losses   (294)
Bond mutual funds    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater   0
Unrealized Losses - 12 months or greater   0
Fair Value - Less than 12 months   12,184
Unrealized Losses - Less than 12 months   (999)
Total Fair Value of Securities in Unrealized Loss Position   12,184
Total Unrealized Losses   (999)
Equity securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater   0
Unrealized Losses - 12 months or greater   0
Fair Value - Less than 12 months   27,709
Unrealized Losses - Less than 12 months   (1,883)
Total Fair Value of Securities in Unrealized Loss Position   27,709
Total Unrealized Losses   $ (1,883)