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INVESTMENTS - Fixed Maturities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Available for sale
Amortized cost	$ 12,272,258		$ 12,176,473
Allowance for expected credit losses	(10,551)	$ (12,645)	(11,733)	$ (7,294)	$ (383)	$ (313)
Gross unrealized gains	17,397		18,742
Gross unrealized losses	(714,707)		(856,588)
Fair value	11,564,397		11,326,894
U.S. government and agency
Available for sale
Amortized cost	2,889,184		2,731,733
Allowance for expected credit losses	0		0
Gross unrealized gains	421		5,386
Gross unrealized losses	(97,593)		(97,789)
Fair value	2,792,012		2,639,330
Non-U.S. government
Available for sale
Amortized cost	621,702		612,546
Allowance for expected credit losses	(17)		0
Gross unrealized gains	2,560		2,395
Gross unrealized losses	(37,633)		(52,912)
Fair value	586,612		562,029
Corporate debt
Available for sale
Amortized cost	4,655,745		4,680,798
Allowance for expected credit losses	(10,397)		(11,521)
Gross unrealized gains	9,342		5,269
Gross unrealized losses	(327,082)		(418,990)
Fair value	4,327,608		4,255,556
Agency RMBS
Available for sale
Amortized cost	1,496,299		1,297,423
Allowance for expected credit losses	0		0
Gross unrealized gains	3,975		4,663
Gross unrealized losses	(96,620)		(99,301)
Fair value	1,403,654		1,202,785
CMBS
Available for sale
Amortized cost	950,340		1,029,863
Allowance for expected credit losses	0		0
Gross unrealized gains	38		60
Gross unrealized losses	(79,271)		(82,145)
Fair value	871,107		947,778
Non-agency RMBS
Available for sale
Amortized cost	149,827		151,907
Allowance for expected credit losses	(100)		(123)
Gross unrealized gains	274		275
Gross unrealized losses	(15,900)		(18,525)
Fair value	134,101		133,534
ABS
Available for sale
Amortized cost	1,347,053		1,499,728
Allowance for expected credit losses	(37)		(35)
Gross unrealized gains	568		555
Gross unrealized losses	(47,028)		(70,721)
Fair value	1,300,556		1,429,527
Municipals
Available for sale
Amortized cost	162,108		172,475
Allowance for expected credit losses	0		(54)
Gross unrealized gains	219		139
Gross unrealized losses	(13,580)		(16,205)
Fair value	$ 148,747		$ 156,355

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount excluding accrued interest, of 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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