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INVESTMENTS - Fixed Maturities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Available for sale
Amortized cost	$ 13,806,792		$ 12,634,254
Allowance for expected credit losses	(4,422)	$ (4,631)	(10,759)	$ (8,933)	$ (10,551)	$ (11,733)
Gross unrealized gains	221,751		91,762
Gross unrealized losses	(255,928)		(480,515)
Fair value	13,768,193		12,234,742
U.S. government and agency
Available for sale
Amortized cost	2,793,879		3,049,445
Allowance for expected credit losses	0		0
Gross unrealized gains	37,888		13,211
Gross unrealized losses	(20,967)		(55,128)
Fair value	2,810,800		3,007,528
Non-U.S. government
Available for sale
Amortized cost	798,756		729,761
Allowance for expected credit losses	(17)		(30)
Gross unrealized gains	25,806		13,089
Gross unrealized losses	(7,914)		(18,861)
Fair value	816,631		723,959
Corporate debt
Available for sale
Amortized cost	5,740,096		4,651,654
Allowance for expected credit losses	(4,164)		(10,438)
Gross unrealized gains	111,523		49,434
Gross unrealized losses	(124,069)		(216,478)
Fair value	5,723,386		4,474,172
Agency RMBS
Available for sale
Amortized cost	1,764,991		1,706,204
Allowance for expected credit losses	0		0
Gross unrealized gains	29,026		11,495
Gross unrealized losses	(46,954)		(83,038)
Fair value	1,747,063		1,634,661
CMBS
Available for sale
Amortized cost	839,795		897,553
Allowance for expected credit losses	0		0
Gross unrealized gains	3,553		551
Gross unrealized losses	(32,591)		(58,408)
Fair value	810,757		839,696
Non-agency RMBS
Available for sale
Amortized cost	132,009		165,910
Allowance for expected credit losses	(190)		(194)
Gross unrealized gains	1,128		713
Gross unrealized losses	(8,502)		(13,033)
Fair value	124,445		153,396
ABS
Available for sale
Amortized cost	1,582,069		1,265,187
Allowance for expected credit losses	(51)		(50)
Gross unrealized gains	11,689		2,855
Gross unrealized losses	(8,605)		(25,021)
Fair value	1,585,102		1,242,971
Municipals
Available for sale
Amortized cost	155,197		168,540
Allowance for expected credit losses	0		(47)
Gross unrealized gains	1,138		414
Gross unrealized losses	(6,326)		(10,548)
Fair value	$ 150,009		$ 158,359

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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