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INVESTMENTS (Fixed Maturities Available For Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Available for sale
Fixed maturities, available for sale, amortized cost	$ 12,202,767		$ 11,566,930
Allowance for expected credit losses	(399)	$ (84)	(323)	$ (2,498)	$ (6,257)	$ 0
Gross unrealized gains	234,472		494,103
Gross unrealized losses	(55,881)		(18,911)
Fair value	12,380,959		12,041,799
U.S. government and agency
Available for sale
Fixed maturities, available for sale, amortized cost	2,688,431		1,881,489
Allowance for expected credit losses	0		0
Gross unrealized gains	14,768		38,969
Gross unrealized losses	(10,805)		(1,759)
Fair value	2,692,394		1,918,699
Non-U.S. government
Available for sale
Fixed maturities, available for sale, amortized cost	714,081		632,875
Allowance for expected credit losses	0		0
Gross unrealized gains	13,696		38,826
Gross unrealized losses	(7,855)		(428)
Fair value	719,922		671,273
Corporate debt
Available for sale
Fixed maturities, available for sale, amortized cost	4,450,477		4,408,351
Allowance for expected credit losses	(324)		(303)
Gross unrealized gains	121,913		254,261
Gross unrealized losses	(24,416)		(6,358)
Fair value	4,547,650		4,655,951
Agency RMBS
Available for sale
Fixed maturities, available for sale, amortized cost	1,144,205		1,244,727
Allowance for expected credit losses	0		0
Gross unrealized gains	24,213		42,170
Gross unrealized losses	(5,380)		(688)
Fair value	1,163,038		1,286,209
CMBS
Available for sale
Fixed maturities, available for sale, amortized cost	1,185,705		1,268,273
Allowance for expected credit losses	0		0
Gross unrealized gains	42,927		87,598
Gross unrealized losses	(2,407)		(2,284)
Fair value	1,226,225		1,353,587
Non-agency RMBS
Available for sale
Fixed maturities, available for sale, amortized cost	192,129		136,198
Allowance for expected credit losses	(75)		(20)
Gross unrealized gains	2,818		4,604
Gross unrealized losses	(1,108)		(678)
Fair value	193,764		140,104
ABS
Available for sale
Fixed maturities, available for sale, amortized cost	1,640,602		1,712,236
Allowance for expected credit losses	0		0
Gross unrealized gains	6,311		14,527
Gross unrealized losses	(3,668)		(6,685)
Fair value	1,643,245		1,720,078
Municipals
Available for sale
Fixed maturities, available for sale, amortized cost	187,137		282,781
Allowance for expected credit losses	0		0
Gross unrealized gains	7,826		13,148
Gross unrealized losses	(242)		(31)
Fair value	$ 194,721		$ 295,898

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