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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 3,940 | $ 6,808 | $ 12,897 | $ 12,126
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,773 | 6,427 | 9,838 | 7,932
Insurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 1,388 | 35,290 | 13,080 | 50,681
Insurance | Marine |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 1,221 | 7,348 | 12,891 | 19,221
Insurance | Aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 1,705 | 4,808 | 4,685 | 5,844
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 4,287 | 4,055 | 5,182 | (1,316)
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,433 | (33,054) | (1,189) | (47,646)
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (11,261) | (12,020) | (24,811) | (18,852)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 1,167 | 381 | 3,059 | 4,194
Reinsurance | Property and other |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 6,547 | 12,310 | 31,333 | 13,278
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (6,000) | (8,600) | (30,522) | (10,804)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (6,823) | (11,358) | (10,928) | (18,512)
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 3,583 | (4,916) | 11,046 | (9,854)
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 3,860 | $ 12,946 | $ 2,130 | $ 30,086

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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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