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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)

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