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INVESTMENTS - Amortized cost or cost and fair values (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fixed maturities
Amortized cost	$ 12,263,240	$ 11,616,312
Gross unrealized gains	236,817	33,874
Gross unrealized losses	(31,852)	(214,839)
Fair value	12,468,205	11,435,347
U.S. government and agency
Fixed maturities
Amortized cost	2,102,849	1,520,142
Gross unrealized gains	16,345	4,232
Gross unrealized losses	(6,313)	(8,677)
Fair value	2,112,881	1,515,697
Non-U.S. government
Fixed maturities
Amortized cost	564,505	507,550
Gross unrealized gains	14,535	1,586
Gross unrealized losses	(2,448)	(16,120)
Fair value	576,592	493,016
Corporate debt
Fixed maturities
Amortized cost	4,797,384	4,990,279
Gross unrealized gains	140,426	15,086
Gross unrealized losses	(7,556)	(128,444)
Fair value	4,930,254	4,876,921
Agency RMBS
Fixed maturities
Amortized cost	1,570,823	1,666,684
Gross unrealized gains	25,215	6,508
Gross unrealized losses	(3,454)	(29,884)
Fair value	1,592,584	1,643,308
CMBS
Fixed maturities
Amortized cost	1,340,156	1,103,507
Gross unrealized gains	29,838	2,818
Gross unrealized losses	(4,942)	(13,795)
Fair value	1,365,052	1,092,530
Non-Agency RMBS
Fixed maturities
Amortized cost	84,381	40,732
Gross unrealized gains	1,393	1,237
Gross unrealized losses	(852)	(1,282)
Fair value	84,922	40,687
ABS
Fixed maturities
Amortized cost	1,599,867	1,651,350
Gross unrealized gains	4,706	1,493
Gross unrealized losses	(5,880)	(15,240)
Fair value	1,598,693	1,637,603
Municipals
Fixed maturities
Amortized cost	203,275	136,068
Gross unrealized gains	4,359	914
Gross unrealized losses	(407)	(1,397)
Fair value	$ 207,227	$ 135,585

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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