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INVESTMENTS - Gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (91,000) $ (197,000)
Fixed maturities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 1,532,513 971,489
Unrealized Losses - 12 months or greater (44,352) (77,645)
Fair Value - Less than 12 months 5,619,002 5,833,715
Unrealized Losses - Less than 12 months (46,521) (119,550)
Total Fair Value of Securities in Unrealized Loss Position 7,151,515 6,805,204
Total Unrealized Losses $ (90,873) $ (197,195)
Number of available for sale securities in unrealized loss positions | security 2,424 1,881
Number of available for sale securities in unrealized loss positions for 12 months or greater | security 627 330
Fixed maturities | Below Investment Grade or Not Rated    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses $ (7,000) $ (15,000)
U.S. government and agency    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 194,916 54,051
Unrealized Losses - 12 months or greater (5,963) (2,729)
Fair Value - Less than 12 months 1,389,792 1,340,719
Unrealized Losses - Less than 12 months (10,946) (24,275)
Total Fair Value of Securities in Unrealized Loss Position 1,584,708 1,394,770
Total Unrealized Losses (16,909) (27,004)
Non-U.S. government    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 62,878 149,360
Unrealized Losses - 12 months or greater (6,806) (38,683)
Fair Value - Less than 12 months 204,110 283,796
Unrealized Losses - Less than 12 months (2,717) (10,971)
Total Fair Value of Securities in Unrealized Loss Position 266,988 433,156
Total Unrealized Losses (9,523) (49,654)
Corporate debt    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 407,300 230,218
Unrealized Losses - 12 months or greater (11,800) (30,652)
Fair Value - Less than 12 months 2,041,845 1,948,976
Unrealized Losses - Less than 12 months (18,051) (44,488)
Total Fair Value of Securities in Unrealized Loss Position 2,449,145 2,179,194
Total Unrealized Losses (29,851) (75,140)
Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 759,255 76,694
Unrealized Losses - 12 months or greater (17,453) (1,101)
Fair Value - Less than 12 months 1,172,313 1,724,170
Unrealized Losses - Less than 12 months (10,247) (34,876)
Total Fair Value of Securities in Unrealized Loss Position 1,931,568 1,800,864
Total Unrealized Losses (27,700) (35,977)
CMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 31,607 84,640
Unrealized Losses - 12 months or greater (703) (749)
Fair Value - Less than 12 months 348,943 193,499
Unrealized Losses - Less than 12 months (2,422) (2,815)
Total Fair Value of Securities in Unrealized Loss Position 380,550 278,139
Total Unrealized Losses (3,125) (3,564)
Non-Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 8,029 13,642
Unrealized Losses - 12 months or greater (788) (1,752)
Fair Value - Less than 12 months 4,197 7,194
Unrealized Losses - Less than 12 months (11) (271)
Total Fair Value of Securities in Unrealized Loss Position 12,226 20,836
Total Unrealized Losses (799) (2,023)
ABS    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 57,298 362,110
Unrealized Losses - 12 months or greater (570) (1,950)
Fair Value - Less than 12 months 392,170 266,763
Unrealized Losses - Less than 12 months (1,424) (893)
Total Fair Value of Securities in Unrealized Loss Position 449,468 628,873
Total Unrealized Losses (1,994) (2,843)
Municipals    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 11,230 774
Unrealized Losses - 12 months or greater (269) (29)
Fair Value - Less than 12 months 65,632 68,598
Unrealized Losses - Less than 12 months (703) (961)
Total Fair Value of Securities in Unrealized Loss Position 76,862 69,372
Total Unrealized Losses (972) (990)
Equity securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 0 4,959
Unrealized Losses - 12 months or greater 0 (461)
Fair Value - Less than 12 months 27,709 211,751
Unrealized Losses - Less than 12 months (1,883) (11,607)
Total Fair Value of Securities in Unrealized Loss Position 27,709 216,710
Total Unrealized Losses $ (1,883) $ (12,068)
Number of available for sale securities in unrealized loss positions | security 29 23
Number of available for sale securities in unrealized loss positions for 12 months or greater | security 0 3
Common stocks    
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 3,202 37
Unrealized Losses - Less than 12 months (590) (342)
Total Fair Value of Securities in Unrealized Loss Position 3,202 37
Total Unrealized Losses (590) (342)
Exchange-traded funds    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 0 4,959
Unrealized Losses - 12 months or greater 0 (461)
Fair Value - Less than 12 months 12,323 87,760
Unrealized Losses - Less than 12 months (294) (2,173)
Total Fair Value of Securities in Unrealized Loss Position 12,323 92,719
Total Unrealized Losses (294) (2,634)
Bond mutual funds    
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 12,184 123,954
Unrealized Losses - Less than 12 months (999) (9,092)
Total Fair Value of Securities in Unrealized Loss Position 12,184 123,954
Total Unrealized Losses $ (999) $ (9,092)