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RESERVE FOR LOSSES AND LOSS EXPENSES - Summary of Prior Year Reserve Development by Segment and Reserving Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	$ (411,882)	$ 25,533	$ 32,410
Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(176,353)	16,350	18,360
Insurance | Property
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	16,195	52,512	71,032
Insurance | Accident and health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(10,236)	(12,856)	15,844
Insurance | Marine and aviation
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	26,977	27,927	42,535
Insurance | Cyber
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	35,579	8,416	(7,329)
Insurance | Professional lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(41,243)	(29,093)	(71,258)
Insurance | Credit and political risk
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	31,691	24,361	10,363
Insurance | Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(235,316)	(54,917)	(42,827)
Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(235,529)	9,183	14,049
Reinsurance | Accident and health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	29,947	14,199	5,861
Reinsurance | Marine and aviation
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	12,595	2,597	(10,767)
Reinsurance | Professional lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(92,181)	(54,820)	(23,718)
Reinsurance | Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(262,114)	(58,148)	(17,919)
Reinsurance | Motor
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	(9,653)	18,161	43,968
Reinsurance | Credit and surety
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	8,306	43,567	3,436
Reinsurance | Agriculture
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	10,781	11,703	423
Reinsurance | Run-off lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	66,790	31,924	12,765
Reinsurance | Run-off lines | Property
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	15,225	42,523	17,651
Reinsurance | Run-off lines | Catastrophe
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	46,297	(504)	(36)
Reinsurance | Run-off lines | Engineering
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior year favorable (adverse) adjustments	$ 5,268	$ (10,095)	$ (4,850)

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+ References

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- Definition

Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-3

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