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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 11,898,060	$ 12,611,219
Gross Unrealized Gains	77,008	101,660
Gross Unrealized Losses	(173,672)	(90,873)
Fair Value (fixed maturities)	11,801,396	12,622,006
Non-credit OTTI in AOCI	(866)	(853)
U.S. government and agency
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,821,951	1,727,643
Gross Unrealized Gains	908	1,735
Gross Unrealized Losses	(25,894)	(16,909)
Fair Value (fixed maturities)	1,796,965	1,712,469
Non-credit OTTI in AOCI	0	0
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	649,396	798,582
Gross Unrealized Gains	21,084	17,240
Gross Unrealized Losses	(9,256)	(9,523)
Fair Value (fixed maturities)	661,224	806,299
Non-credit OTTI in AOCI	0	0
Corporate debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,670,815	5,265,795
Gross Unrealized Gains	40,698	61,922
Gross Unrealized Losses	(71,082)	(29,851)
Fair Value (fixed maturities)	4,640,431	5,297,866
Non-credit OTTI in AOCI	0	0
Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,956,394	2,414,720
Gross Unrealized Gains	4,644	8,132
Gross Unrealized Losses	(46,193)	(27,700)
Fair Value (fixed maturities)	1,914,845	2,395,152
Non-credit OTTI in AOCI	0	0
CMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,042,704	776,715
Gross Unrealized Gains	1,964	4,138
Gross Unrealized Losses	(14,047)	(3,125)
Fair Value (fixed maturities)	1,030,621	777,728
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	39,930	45,713
Gross Unrealized Gains	1,997	1,917
Gross Unrealized Losses	(530)	(799)
Fair Value (fixed maturities)	41,397	46,831
Non-credit OTTI in AOCI	(866)	(853)
ABS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,566,484	1,432,884
Gross Unrealized Gains	4,932	5,391
Gross Unrealized Losses	(4,718)	(1,994)
Fair Value (fixed maturities)	1,566,698	1,436,281
Non-credit OTTI in AOCI	0	0
Municipals
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	150,386	149,167
Gross Unrealized Gains	781	1,185
Gross Unrealized Losses	(1,952)	(972)
Fair Value (fixed maturities)	149,215	149,380
Non-credit OTTI in AOCI	$ 0	$ 0

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security.

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