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DERIVATIVE INSTRUMENTS - Gains (Losses) on Derivatives Recognized in Net Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (loss) recognized in earnings for derivatives not designated as hedges | $ 1,783 | $ (1,456) | $ 7,656
Not Designated as Hedging Instruments |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (loss) recognized in earnings for derivatives not designated as hedges | 15,182 | 6,665 | (20,411)
Not Designated as Hedging Instruments | 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 (loss) recognized in earnings for derivatives not designated as hedges | 1,783 | (1,456) | 7,656
Not Designated as Hedging Instruments | 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 (loss) recognized in earnings for derivatives not designated as hedges | 13,399 | 8,121 | (31,609)
Not Designated as Hedging Instruments | Underwriting Portfolio | Other underwriting-related contracts | Other insurance related income |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (loss) recognized in earnings for derivatives not designated as hedges | $ 0 | $ 0 | $ 3,542

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