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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)

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