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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 110,796 | $ 51,560 | $ 231,253 | $ 151,988
Investment expenses | (6,124) | (6,520) | (12,417) | (13,848)
Net investment income | 104,672 | 45,040 | 218,836 | 138,140
Fixed maturities, available for sale |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 61,244 | 80,459 | 130,714 | 170,402
Other investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 41,414 | (37,580) | 83,248 | (39,700)
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 3,100 | 2,263 | 5,598 | 4,387
Mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 4,355 | 3,660 | 8,541 | 7,713
Cash and cash equivalents |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 617 | 2,392 | 2,953 | 7,323
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 66 | $ 366 | $ 199 | $ 1,863

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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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