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INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 94,888 | $ 113,640 | $ 291,971 | $ 344,891
Investment expenses | (6,711) | (6,301) | (20,227) | (18,717)
Net investment income | 88,177 | 107,339 | 271,744 | 326,174
Fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 87,364 | 63,712 | 224,780 | 194,426
Other investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | (7,576) | 41,695 | 32,801 | 124,941
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 2,490 | 2,724 | 7,349 | 8,322
Mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 6,256 | 4,426 | 15,323 | 12,967
Cash and cash equivalents |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 5,350 | 692 | 10,147 | 3,645
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 1,004 | $ 391 | $ 1,571 | $ 590

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- Definition The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium) of interest income and dividend income on nonoperating securities, net of investment expense. + References No definition available. + Details
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