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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development By Segment and Line of Business (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	$ 0	$ 6,319	$ 0	$ 10,357
Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	2,784	0	3,825
Insurance | Property
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(208)	8,011	5,692
Insurance | Accident and health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(248)	0	(552)
Insurance | Marine and aviation
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	2,682	(8,011)	15,903
Insurance | Cyber
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	676	0	9,128
Insurance | Professional lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(3,498)	0	(16,092)
Insurance | Credit and political risk
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	8,430	0	12,949
Insurance | Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(5,050)	0	(23,203)
Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	3,535	0	6,532
Reinsurance | Accident and health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	7,284	0	14,273
Reinsurance | Marine and aviation
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	5,197	0	4,947
Reinsurance | Professional lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(10,504)	0	(13,728)
Reinsurance | Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(7,017)	0	(39,870)
Reinsurance | Agriculture
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	2,122	0	14,013
Reinsurance | Credit and surety
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(582)	0	(1,128)
Reinsurance | Motor
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	(4,825)	0	(21,946)
Reinsurance | Run-Off Lines
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	11,860	0	49,971
Reinsurance | Run-Off Lines | Property
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	2,264	0	9,147
Reinsurance | Run-Off Lines | Catastrophe
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	0	7,487	0	38,546
Reinsurance | Run-Off Lines | Engineering
Liability for Future Policy Benefit, by Product Segment [Line Items]
Net favorable (adverse) prior year reserve development	$ 0	$ 2,109	$ 0	$ 2,278

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+ References

No definition available.

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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/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-7

Reference 2: 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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