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DERIVATIVE INSTRUMENTS - Summary of Total Unrealized and Realized Gains (Loss) on Derivatives Not Designated as Hedges Recorded in Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | $ 7,656 | $ 4,346 | $ (2,434)
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 | (20,411) | (43,650) | 32,697
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 | 7,656 | 4,346 | (2,434)
Not Designated as Hedging Instruments | 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 (loss) recognized in earnings for derivatives not designated as hedges | (31,609) | (50,738) | 44,166
Not Designated as Hedging Instruments | Relating to underwriting portfolio: | Other underwriting-related contracts | Other insurance related income (loss) |  |  |
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 | $ 3,542 | $ 2,742 | $ (9,035)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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