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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 14,695,585 | $ 14,351,402
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 7,331,398 | 7,180,129
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 4,474,372 | 4,390,568
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 481,850 | 395,149
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 364,048 | 383,838
Residential mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 786,680 | 710,429
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 215,655 | 213,987
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 1,041,582 | $ 1,077,302

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