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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 12,671,098 | $ 13,507,131
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 5,745,880 | 6,247,779
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 4,121,508 | 3,689,286
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 375,894 | 361,684
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 443,869 | 549,613
Residential mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 698,496 | 955,301
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 257,827 | 634,925
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 1,027,624 | $ 1,068,543

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