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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fixed maturities
Amortized Cost	$ 11,941,555	$ 12,611,219
Gross Unrealized Gains	33,562	101,660
Gross Unrealized Losses	(207,420)	(90,873)
Fair Value	11,767,697	12,622,006
Non-credit OTTI in AOCI	(868)	(853)
U.S. government and agency
Fixed maturities
Amortized Cost	1,625,114	1,727,643
Gross Unrealized Gains	414	1,735
Gross Unrealized Losses	(20,063)	(16,909)
Fair Value	1,605,465	1,712,469
Non-credit OTTI in AOCI	0	0
Non-U.S. government
Fixed maturities
Amortized Cost	558,862	798,582
Gross Unrealized Gains	3,013	17,240
Gross Unrealized Losses	(13,750)	(9,523)
Fair Value	548,125	806,299
Non-credit OTTI in AOCI	0	0
Corporate debt
Fixed maturities
Amortized Cost	5,144,747	5,265,795
Gross Unrealized Gains	23,714	61,922
Gross Unrealized Losses	(87,376)	(29,851)
Fair Value	5,081,085	5,297,866
Non-credit OTTI in AOCI	0	0
Agency RMBS
Fixed maturities
Amortized Cost	1,688,977	2,414,720
Gross Unrealized Gains	2,140	8,132
Gross Unrealized Losses	(51,886)	(27,700)
Fair Value	1,639,231	2,395,152
Non-credit OTTI in AOCI	0	0
CMBS
Fixed maturities
Amortized Cost	1,099,728	776,715
Gross Unrealized Gains	729	4,138
Gross Unrealized Losses	(23,502)	(3,125)
Fair Value	1,076,955	777,728
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS
Fixed maturities
Amortized Cost	41,273	45,713
Gross Unrealized Gains	1,475	1,917
Gross Unrealized Losses	(962)	(799)
Fair Value	41,786	46,831
Non-credit OTTI in AOCI	(868)	(853)
ABS
Fixed maturities
Amortized Cost	1,651,271	1,432,884
Gross Unrealized Gains	1,520	5,391
Gross Unrealized Losses	(6,980)	(1,994)
Fair Value	1,645,811	1,436,281
Non-credit OTTI in AOCI	0	0
Municipals
Fixed maturities
Amortized Cost	131,583	149,167
Gross Unrealized Gains	557	1,185
Gross Unrealized Losses	(2,901)	(972)
Fair Value	129,239	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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