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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
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Mar. 31, 2022 | Mar. 31, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | $ 8,956 | $ 5,317
Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 7,062 | 1,505
Insurance | Property and other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 11,692 | 15,391
Insurance | Marine |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 11,666 | 11,875
Insurance | Aviation |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 2,980 | 1,035
Insurance | Credit and political risk |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 895 | (5,371)
Insurance | Professional lines |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | (6,622) | (14,593)
Insurance | Liability |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | (13,549) | (6,832)
Reinsurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 1,894 | 3,812
Reinsurance | Property and other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 24,786 | 969
Reinsurance | Professional lines |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | (24,522) | (2,204)
Reinsurance | Liability |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | (4,105) | (7,154)
Reinsurance | Credit and surety |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | 7,465 | (4,939)
Reinsurance | Motor |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Prior years - net favorable (adverse) effect | $ (1,730) | $ 17,140

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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