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DERIVATIVE INSTRUMENTS - Other Underwriting-related Risks (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 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 | $ (25,957) | $ (797) | $ (51,137) | $ (24,443)
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 | 4,822 | (537) | 7,063 | 1,212
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 | (31,146) | (604) | (59,122) | (26,660)
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 | $ 367 | $ 344 | $ 922 | $ 1,005

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