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DERIVATIVE INSTRUMENTS - Gains (Losses) on Derivatives Recognized in Net Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
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 | $ (3,540) | $ (25,957) | $ 6,763 | $ (51,137)
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 | (527) | 4,822 | (1,474) | 7,063
Relating to underwriting portfolio: | Foreign exchange forward contracts | Foreign exchange (losses) gains |  |  |  |
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 | (3,013) | (31,146) | 8,237 | (59,122)
Relating to underwriting portfolio: | Other Contract | 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 | $ 0 | $ 367 | $ 0 | $ 922

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