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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands	Sep. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
U.S. government and agency
Fixed maturities
Fair Value - 12 months or greater	$ 311,591	$ 194,916
Unrealized Losses - 12 months or greater	(10,619)	(5,963)
Fair Value - Less than 12 months	1,228,100	1,389,792
Unrealized Losses - Less than 12 months	(9,444)	(10,946)
Total Fair Value of Securities in Unrealized Loss Position	1,539,691	1,584,708
Total Unrealized Losses	(20,063)	(16,909)
Non-U.S. government
Fixed maturities
Fair Value - 12 months or greater	34,550	62,878
Unrealized Losses - 12 months or greater	(2,086)	(6,806)
Fair Value - Less than 12 months	382,172	204,110
Unrealized Losses - Less than 12 months	(11,664)	(2,717)
Total Fair Value of Securities in Unrealized Loss Position	416,722	266,988
Total Unrealized Losses	(13,750)	(9,523)
Corporate debt
Fixed maturities
Fair Value - 12 months or greater	621,298	407,300
Unrealized Losses - 12 months or greater	(28,190)	(11,800)
Fair Value - Less than 12 months	3,256,619	2,041,845
Unrealized Losses - Less than 12 months	(59,186)	(18,051)
Total Fair Value of Securities in Unrealized Loss Position	3,877,917	2,449,145
Total Unrealized Losses	(87,376)	(29,851)
Agency RMBS
Fixed maturities
Fair Value - 12 months or greater	722,287	759,255
Unrealized Losses - 12 months or greater	(33,738)	(17,453)
Fair Value - Less than 12 months	780,730	1,172,313
Unrealized Losses - Less than 12 months	(18,148)	(10,247)
Total Fair Value of Securities in Unrealized Loss Position	1,503,017	1,931,568
Total Unrealized Losses	(51,886)	(27,700)
CMBS
Fixed maturities
Fair Value - 12 months or greater	105,887	31,607
Unrealized Losses - 12 months or greater	(3,944)	(703)
Fair Value - Less than 12 months	832,183	348,943
Unrealized Losses - Less than 12 months	(19,558)	(2,422)
Total Fair Value of Securities in Unrealized Loss Position	938,070	380,550
Total Unrealized Losses	(23,502)	(3,125)
Non-Agency RMBS
Fixed maturities
Fair Value - 12 months or greater	10,821	8,029
Unrealized Losses - 12 months or greater	(946)	(788)
Fair Value - Less than 12 months	6,067	4,197
Unrealized Losses - Less than 12 months	(16)	(11)
Total Fair Value of Securities in Unrealized Loss Position	16,888	12,226
Total Unrealized Losses	(962)	(799)
ABS
Fixed maturities
Fair Value - 12 months or greater	157,894	57,298
Unrealized Losses - 12 months or greater	(2,115)	(570)
Fair Value - Less than 12 months	844,190	392,170
Unrealized Losses - Less than 12 months	(4,865)	(1,424)
Total Fair Value of Securities in Unrealized Loss Position	1,002,084	449,468
Total Unrealized Losses	(6,980)	(1,994)
Municipals
Fixed maturities
Fair Value - 12 months or greater	33,043	11,230
Unrealized Losses - 12 months or greater	(1,327)	(269)
Fair Value - Less than 12 months	71,150	65,632
Unrealized Losses - Less than 12 months	(1,574)	(703)
Total Fair Value of Securities in Unrealized Loss Position	104,193	76,862
Total Unrealized Losses	(2,901)	(972)
Fixed maturities
Fixed maturities
Fair Value - 12 months or greater	1,997,371	1,532,513
Unrealized Losses - 12 months or greater	(82,965)	(44,352)
Fair Value - Less than 12 months	7,401,211	5,619,002
Unrealized Losses - Less than 12 months	(124,455)	(46,521)
Total Fair Value of Securities in Unrealized Loss Position	9,398,582	7,151,515
Total Unrealized Losses	$ (207,420)	$ (90,873)
Equity securities
Number of available for sale securities in unrealized loss positions | security	3,444	2,424
Number of available for sale securities in unrealized loss positions for 12 months or greater | security	940	627
Fixed maturities | Below Investment Grade or Not Rated
Fixed maturities
Total Unrealized Losses	$ (13,000)	$ (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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