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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year development (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years | $ 6,808 | $ 2,655 | $ 12,126 | $ 8,767
Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years | 6,427 | 420 | 7,932 | 4,251
Reinsurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years | $ 381 | $ 2,235 | $ 4,194 | $ 4,516

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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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