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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 11,012 | $ 584 | $ 23,138 | $ 9,351
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,418 | 270 | 13,351 | 4,521
Insurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 12,486 | 6,907 | 63,167 | 42,688
Insurance | Marine |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 4,189 | 4,095 | 23,411 | 633
Insurance | Aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 3,958 | (326) | 9,802 | 5,667
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 7,610 | 871 | 6,294 | (223)
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (20,759) | (7,287) | (68,405) | (19,086)
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (2,066) | (3,990) | (20,918) | (25,158)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,594 | 314 | 9,787 | 4,830
Reinsurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (5,486) | 3,126 | 7,792 | (4,961)
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (3,244) | (13,776) | (14,048) | (13,493)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (2,645) | (1,434) | (21,157) | (23,375)
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 8,624 | 11,184 | (1,231) | 27,927
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 8,345 | $ 1,214 | $ 38,431 | $ 18,732

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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 + Details
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