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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands	Jun. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
U.S. government and agency
Fixed maturities
Fair Value - 12 months or greater	$ 125,039	$ 194,916
Unrealized Losses - 12 months or greater	(6,565)	(5,963)
Fair Value - Less than 12 months	1,378,293	1,389,792
Unrealized Losses - Less than 12 months	(16,595)	(10,946)
Total Fair Value of Securities in Unrealized Loss Position	1,503,332	1,584,708
Total Unrealized Losses	(23,160)	(16,909)
Non-U.S. government
Fixed maturities
Fair Value - 12 months or greater	63,216	62,878
Unrealized Losses - 12 months or greater	(7,352)	(6,806)
Fair Value - Less than 12 months	326,670	204,110
Unrealized Losses - Less than 12 months	(8,762)	(2,717)
Total Fair Value of Securities in Unrealized Loss Position	389,886	266,988
Total Unrealized Losses	(16,114)	(9,523)
Corporate debt
Fixed maturities
Fair Value - 12 months or greater	325,074	407,300
Unrealized Losses - 12 months or greater	(17,362)	(11,800)
Fair Value - Less than 12 months	3,513,735	2,041,845
Unrealized Losses - Less than 12 months	(75,603)	(18,051)
Total Fair Value of Securities in Unrealized Loss Position	3,838,809	2,449,145
Total Unrealized Losses	(92,965)	(29,851)
Agency RMBS
Fixed maturities
Fair Value - 12 months or greater	527,560	759,255
Unrealized Losses - 12 months or greater	(23,601)	(17,453)
Fair Value - Less than 12 months	836,763	1,172,313
Unrealized Losses - Less than 12 months	(19,314)	(10,247)
Total Fair Value of Securities in Unrealized Loss Position	1,364,323	1,931,568
Total Unrealized Losses	(42,915)	(27,700)
CMBS
Fixed maturities
Fair Value - 12 months or greater	29,405	31,607
Unrealized Losses - 12 months or greater	(1,556)	(703)
Fair Value - Less than 12 months	925,264	348,943
Unrealized Losses - Less than 12 months	(19,767)	(2,422)
Total Fair Value of Securities in Unrealized Loss Position	954,669	380,550
Total Unrealized Losses	(21,323)	(3,125)
Non-Agency RMBS
Fixed maturities
Fair Value - 12 months or greater	7,455	8,029
Unrealized Losses - 12 months or greater	(763)	(788)
Fair Value - Less than 12 months	4,320	4,197
Unrealized Losses - Less than 12 months	(79)	(11)
Total Fair Value of Securities in Unrealized Loss Position	11,775	12,226
Total Unrealized Losses	(842)	(799)
ABS
Fixed maturities
Fair Value - 12 months or greater	27,316	57,298
Unrealized Losses - 12 months or greater	(413)	(570)
Fair Value - Less than 12 months	853,002	392,170
Unrealized Losses - Less than 12 months	(6,012)	(1,424)
Total Fair Value of Securities in Unrealized Loss Position	880,318	449,468
Total Unrealized Losses	(6,425)	(1,994)
Municipals
Fixed maturities
Fair Value - 12 months or greater	11,037	11,230
Unrealized Losses - 12 months or greater	(414)	(269)
Fair Value - Less than 12 months	97,649	65,632
Unrealized Losses - Less than 12 months	(1,921)	(703)
Total Fair Value of Securities in Unrealized Loss Position	108,686	76,862
Total Unrealized Losses	(2,335)	(972)
Fixed maturities
Fixed maturities
Fair Value - 12 months or greater	1,116,102	1,532,513
Unrealized Losses - 12 months or greater	(58,026)	(44,352)
Fair Value - Less than 12 months	7,935,696	5,619,002
Unrealized Losses - Less than 12 months	(148,053)	(46,521)
Total Fair Value of Securities in Unrealized Loss Position	9,051,798	7,151,515
Total Unrealized Losses	$ (206,079)	$ (90,873)
Equity securities
Number of available for sale securities in unrealized loss positions | security	3,364	2,424
Number of available for sale securities in unrealized loss positions for 12 months or greater | security	563	627
Fixed maturities | Below Investment Grade or Not Rated
Fixed maturities
Total Unrealized Losses	$ (17,000)	$ (7,000)
Common stocks
Equity securities
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
Equity securities
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
Equity securities
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
Equity securities
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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