INVESTMENTS (DETAILS 3) $ in Thousands	Jun. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Fixed Maturities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	$ 1,514,255	$ 1,317,794
Unrealized Losses - 12 months or greater	(79,581)	(106,770)
Fair Value - Less than 12 months	1,539,422	7,145,067
Unrealized Losses - Less than 12 months	(41,706)	(123,638)
Total Fair Value of Securities in Unrealized Loss Position	3,053,677	8,462,861
Total Unrealized Losses	$ (121,287)	$ (230,408)
Number of Available For Sale Securities In Unrealized Loss Positions | security	1,115	2,314
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security	429	383
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
Schedule Of Available For Sale Securities [Line Items]
Total Unrealized Losses	$ (21,000)	$ (39,000)
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	66,551	84,179
Unrealized Losses - 12 months or greater	(1,864)	(7,622)
Fair Value - Less than 12 months	80,664	1,474,202
Unrealized Losses - Less than 12 months	(31)	(15,591)
Total Fair Value of Securities in Unrealized Loss Position	147,215	1,558,381
Total Unrealized Losses	(1,895)	(23,213)
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	127,388	170,269
Unrealized Losses - 12 months or greater	(36,001)	(50,841)
Fair Value - Less than 12 months	271,036	317,693
Unrealized Losses - Less than 12 months	(18,011)	(21,491)
Total Fair Value of Securities in Unrealized Loss Position	398,424	487,962
Total Unrealized Losses	(54,012)	(72,332)
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	342,184	340,831
Unrealized Losses - 12 months or greater	(28,316)	(33,441)
Fair Value - Less than 12 months	673,041	2,845,375
Unrealized Losses - Less than 12 months	(19,455)	(62,845)
Total Fair Value of Securities in Unrealized Loss Position	1,015,225	3,186,206
Total Unrealized Losses	(47,771)	(96,286)
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	74,590	64,792
Unrealized Losses - 12 months or greater	(449)	(1,609)
Fair Value - Less than 12 months	54,383	1,073,566
Unrealized Losses - Less than 12 months	(203)	(8,066)
Total Fair Value of Securities in Unrealized Loss Position	128,973	1,138,358
Total Unrealized Losses	(652)	(9,675)
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	113,021	75,627
Unrealized Losses - 12 months or greater	(1,573)	(1,579)
Fair Value - Less than 12 months	230,571	659,480
Unrealized Losses - Less than 12 months	(1,016)	(7,603)
Total Fair Value of Securities in Unrealized Loss Position	343,592	735,107
Total Unrealized Losses	(2,589)	(9,182)
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	10,366	5,283
Unrealized Losses - 12 months or greater	(331)	(210)
Fair Value - Less than 12 months	11,773	43,199
Unrealized Losses - Less than 12 months	(1,355)	(763)
Total Fair Value of Securities in Unrealized Loss Position	22,139	48,482
Total Unrealized Losses	(1,686)	(973)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	765,201	562,599
Unrealized Losses - 12 months or greater	(10,568)	(11,158)
Fair Value - Less than 12 months	215,552	667,448
Unrealized Losses - Less than 12 months	(1,627)	(6,443)
Total Fair Value of Securities in Unrealized Loss Position	980,753	1,230,047
Total Unrealized Losses	(12,195)	(17,601)
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	14,954	14,214
Unrealized Losses - 12 months or greater	(479)	(310)
Fair Value - Less than 12 months	2,402	64,104
Unrealized Losses - Less than 12 months	(8)	(836)
Total Fair Value of Securities in Unrealized Loss Position	17,356	78,318
Total Unrealized Losses	(487)	(1,146)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	5,337	2,331
Unrealized Losses - 12 months or greater	(327)	(313)
Fair Value - Less than 12 months	86,353	234,997
Unrealized Losses - Less than 12 months	(4,116)	(8,676)
Total Fair Value of Securities in Unrealized Loss Position	91,690	237,328
Total Unrealized Losses	$ (4,443)	$ (8,989)
Number of Available For Sale Securities In Unrealized Loss Positions | security	29	35
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater | security	11	1
Common Stock [Member]
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	61	0
Unrealized Losses - Less than 12 months	(318)	0
Total Fair Value of Securities in Unrealized Loss Position	61	0
Total Unrealized Losses	(318)	0
Exchange-Traded Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value - 12 months or greater	5,337	2,331
Unrealized Losses - 12 months or greater	(327)	(313)
Fair Value - Less than 12 months	86,292	110,972
Unrealized Losses - Less than 12 months	(3,798)	(4,449)
Total Fair Value of Securities in Unrealized Loss Position	91,629	113,303
Total Unrealized Losses	(4,125)	(4,762)
Bond Mutual Funds [Member]
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	0	124,025
Unrealized Losses - Less than 12 months	0	(4,227)
Total Fair Value of Securities in Unrealized Loss Position	0	124,025
Total Unrealized Losses	$ 0	$ (4,227)