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INVESTMENTS - Fixed Maturities Available For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Available for sale
Amortized cost	$ 12,634,254	$ 12,176,473
Allowance for expected credit losses	(10,759)	(11,733)	$ (313)	$ (323)
Gross unrealized gains	91,762	18,742
Gross unrealized losses	(480,515)	(856,588)
Fair value	12,234,742	11,326,894
U.S. government and agency
Available for sale
Amortized cost	3,049,445	2,731,733
Allowance for expected credit losses	0	0
Gross unrealized gains	13,211	5,386
Gross unrealized losses	(55,128)	(97,789)
Fair value	3,007,528	2,639,330
Non-U.S. government
Available for sale
Amortized cost	729,761	612,546
Allowance for expected credit losses	(30)	0
Gross unrealized gains	13,089	2,395
Gross unrealized losses	(18,861)	(52,912)
Fair value	723,959	562,029
Corporate debt
Available for sale
Amortized cost	4,651,654	4,680,798
Allowance for expected credit losses	(10,438)	(11,521)
Gross unrealized gains	49,434	5,269
Gross unrealized losses	(216,478)	(418,990)
Fair value	4,474,172	4,255,556
Agency RMBS
Available for sale
Amortized cost	1,706,204	1,297,423
Allowance for expected credit losses	0	0
Gross unrealized gains	11,495	4,663
Gross unrealized losses	(83,038)	(99,301)
Fair value	1,634,661	1,202,785
CMBS
Available for sale
Amortized cost	897,553	1,029,863
Allowance for expected credit losses	0	0
Gross unrealized gains	551	60
Gross unrealized losses	(58,408)	(82,145)
Fair value	839,696	947,778
Non-agency RMBS
Available for sale
Amortized cost	165,910	151,907
Allowance for expected credit losses	(194)	(123)
Gross unrealized gains	713	275
Gross unrealized losses	(13,033)	(18,525)
Fair value	153,396	133,534
ABS
Available for sale
Amortized cost	1,265,187	1,499,728
Allowance for expected credit losses	(50)	(35)
Gross unrealized gains	2,855	555
Gross unrealized losses	(25,021)	(70,721)
Fair value	1,242,971	1,429,527
Municipals
Available for sale
Amortized cost	168,540	172,475
Allowance for expected credit losses	(47)	(54)
Gross unrealized gains	414	139
Gross unrealized losses	(10,548)	(16,205)
Fair value	$ 158,359	$ 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
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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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

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-Topic 326
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