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DERIVATIVE INSTRUMENTS - Other Underwriting-related Risks (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
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 | $ (25,179) | $ (23,646)
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 | 2,242 | 1,749
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 | (27,976) | (26,056)
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 | $ 555 | $ 661

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