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DERIVATIVE INSTRUMENTS (Other Underwriting-related Risks) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ (7,729) | $ (12,272)
Relating to investment portfolio | Foreign exchange forward contracts | Net investment gains (losses) |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | 3,162 | 752
Relating to investment portfolio | Interest rate swaps | Net investment gains (losses) |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | 0 | (2,854)
Relating to underwriting portfolio | Foreign exchange forward contracts | Foreign exchange gains (losses) |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | (690) | (10,517)
Relating to underwriting portfolio | Other underwriting-related contracts | Other insurance related income (losses) |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ (10,201) | $ 347

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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