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DERIVATIVE INSTRUMENTS - Schedule of Location and Amount of the Gain (Loss) Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 13,681 | $ (70,671) | $ (61,718) | $ (56,496)
Derivative instruments not designated as hedges |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 15,042 | (71,262) | (63,211) | (58,035)
Derivative instruments not designated as hedges | Interest rate futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 2,931 | (47,030) | (52,349) | (21,547)
Derivative instruments not designated as hedges | Foreign currency forward contracts, underwriting and non-investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 8,554 | 4,900 | 4,073 | 9,645
Derivative instruments not designated as hedges | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (3,886) | (11,111) | (19,852) | (14,791)
Derivative instruments not designated as hedges | Credit default swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,725) | (17,460) | (23,029) | (29,414)
Derivative instruments not designated as hedges | Equity futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 10 | (561) | 10 | (1,928)
Derivative instruments not designated as hedges | Warrants |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,046) | 0 | (1,046) | 0
Derivative instruments not designated as hedges | Commodity options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,879) | 0 | (2,249) | 0
Derivative instruments not designated as hedges | Commodity futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 12,083 | 0 | 31,231 | 0
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ (1,361) | $ 591 | $ 1,493 | $ 1,539

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