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DERIVATIVE INSTRUMENTS - Gain (Loss) Recognized in the Consolidated Statements of Operations Related to its Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | $ 14,175 | $ (66,348)
Derivative instruments not designated as hedges |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 13,227 | (63,321)
Derivative instruments not designated as hedges | Interest rate futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 25,483 | (28,787)
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 | 4,745 | (21,142)
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 | (3,680) | (1,891)
Derivative instruments not designated as hedges | Credit default swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (11,954) | (4,137)
Derivative instruments not designated as hedges | Equity futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (1,367) | (7,364)
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) | $ 948 | $ (3,027)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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