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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year development (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	$ 11,012	$ 584	$ 23,138	$ 9,351
Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	5,418	270	13,351	4,521
Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	$ 5,594	$ 314	$ 9,787	$ 4,830

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- Definition

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

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