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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fixed maturities
Amortized cost	$ 11,834,207	$ 11,616,312
Gross unrealized gains	115,142	33,874
Gross unrealized losses	(74,831)	(214,839)
Fair value	11,874,518	11,435,347
Non-credit OTTI in AOCI	(819)	(857)
U.S. government and agency
Fixed maturities
Amortized cost	1,965,801	1,520,142
Gross unrealized gains	12,365	4,232
Gross unrealized losses	(4,512)	(8,677)
Fair value	1,973,654	1,515,697
Non-credit OTTI in AOCI	0	0
Non-U.S. government
Fixed maturities
Amortized cost	488,056	507,550
Gross unrealized gains	6,448	1,586
Gross unrealized losses	(6,841)	(16,120)
Fair value	487,663	493,016
Non-credit OTTI in AOCI	0	0
Corporate debt
Fixed maturities
Amortized cost	4,809,079	4,990,279
Gross unrealized gains	62,910	15,086
Gross unrealized losses	(33,724)	(128,444)
Fair value	4,838,265	4,876,921
Non-credit OTTI in AOCI	0	0
Agency RMBS
Fixed maturities
Amortized cost	1,708,610	1,666,684
Gross unrealized gains	14,430	6,508
Gross unrealized losses	(17,078)	(29,884)
Fair value	1,705,962	1,643,308
Non-credit OTTI in AOCI	0	0
CMBS
Fixed maturities
Amortized cost	1,040,474	1,103,507
Gross unrealized gains	13,491	2,818
Gross unrealized losses	(1,825)	(13,795)
Fair value	1,052,140	1,092,530
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS
Fixed maturities
Amortized cost	47,125	40,732
Gross unrealized gains	1,307	1,237
Gross unrealized losses	(1,021)	(1,282)
Fair value	47,411	40,687
Non-credit OTTI in AOCI	(819)	(857)
ABS
Fixed maturities
Amortized cost	1,619,648	1,651,350
Gross unrealized gains	2,710	1,493
Gross unrealized losses	(9,348)	(15,240)
Fair value	1,613,010	1,637,603
Non-credit OTTI in AOCI	0	0
Municipals
Fixed maturities
Amortized cost	155,414	136,068
Gross unrealized gains	1,481	914
Gross unrealized losses	(482)	(1,397)
Fair value	156,413	135,585
Non-credit OTTI in AOCI	$ 0	$ 0

X

- Definition

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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