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INVESTMENTS (Fixed Maturities Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Available for sale
Amortized cost	$ 11,480,507	$ 11,566,930
Allowance for expected credit losses	(234)	(323)	$ (20,019)	$ 0
Gross unrealized gains	309,330	494,103
Gross unrealized losses	(60,992)	(18,911)
Fair value	11,728,611	12,041,799
U.S. government and agency
Available for sale
Amortized cost	2,181,808	1,881,489
Allowance for expected credit losses	0	0
Gross unrealized gains	20,184	38,969
Gross unrealized losses	(14,899)	(1,759)
Fair value	2,187,093	1,918,699
Non-U.S. government
Available for sale
Amortized cost	689,358	632,875
Allowance for expected credit losses	0	0
Gross unrealized gains	28,789	38,826
Gross unrealized losses	(3,426)	(428)
Fair value	714,721	671,273
Corporate debt
Available for sale
Amortized cost	4,364,800	4,408,351
Allowance for expected credit losses	(164)	(303)
Gross unrealized gains	157,099	254,261
Gross unrealized losses	(26,457)	(6,358)
Fair value	4,495,278	4,655,951
Agency RMBS
Available for sale
Amortized cost	1,186,277	1,244,727
Allowance for expected credit losses	0	0
Gross unrealized gains	29,602	42,170
Gross unrealized losses	(7,385)	(688)
Fair value	1,208,494	1,286,209
CMBS
Available for sale
Amortized cost	1,227,004	1,268,273
Allowance for expected credit losses	0	0
Gross unrealized gains	50,586	87,598
Gross unrealized losses	(3,541)	(2,284)
Fair value	1,274,049	1,353,587
Non-agency RMBS
Available for sale
Amortized cost	163,617	136,198
Allowance for expected credit losses	(70)	(20)
Gross unrealized gains	4,505	4,604
Gross unrealized losses	(883)	(678)
Fair value	167,169	140,104
ABS
Available for sale
Amortized cost	1,396,130	1,712,236
Allowance for expected credit losses	0	0
Gross unrealized gains	9,693	14,527
Gross unrealized losses	(2,862)	(6,685)
Fair value	1,402,961	1,720,078
Municipals
Available for sale
Amortized cost	271,513	282,781
Allowance for expected credit losses	0	0
Gross unrealized gains	8,872	13,148
Gross unrealized losses	(1,539)	(31)
Fair value	$ 278,846	$ 295,898

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