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DERIVATIVE INSTRUMENTS - Gains (Losses) on Derivatives Recognized in Net Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
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 | $ 6,036 | $ (5,516) | $ 8,140 | $ 1,248
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 | (870) | 1,692 | 153 | 218
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 | $ 6,906 | $ (7,208) | $ 7,987 | $ 1,030

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