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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development By Segment, Reserving Class And Accident Year (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 4,735 | $ 11,012 | $ 17,632 | $ 23,138
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,558 | 5,418 | 12,396 | 13,351
Insurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,211 | 12,486 | 18,290 | 63,167
Insurance | Marine |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 17,346 | 4,189 | 30,239 | 23,411
Insurance | Aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 3,203 | 3,958 | 7,888 | 9,802
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 8,106 | 7,610 | 13,288 | 6,294
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (2,747) | (20,759) | (3,937) | (68,405)
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (28,561) | (2,066) | (53,372) | (20,918)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,177 | 5,594 | 5,236 | 9,787
Reinsurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 12,794 | (5,486) | 44,127 | 7,792
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (11,431) | (3,244) | (41,954) | (14,048)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (11,940) | (2,645) | (22,868) | (21,157)
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,905 | 8,623 | 16,952 | (1,231)
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 6,849 | $ 8,345 | $ 8,979 | $ 38,431

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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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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