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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Net Investment Income [Line Items] |  |
Gross investment income | $ 100,429 | $ 113,363
Investment expenses | (7,328) | (6,060)
Net investment income | 93,101 | 107,303
Fixed maturities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 89,943 | 91,382
Other investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | (2,120) | 6,895
Equity securities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 2,125 | 2,328
Mortgage loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 4,053 | 3,063
Cash and cash equivalents |  |
Net Investment Income [Line Items] |  |
Gross investment income | 4,930 | 5,801
Short-term investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | $ 1,498 | $ 3,894

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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. + References No definition available. + Details
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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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