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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 51,560 | $ 144,734 | $ 151,988 | $ 258,099
Investment expenses | (6,520) | (6,785) | (13,848) | (12,845)
Net investment income | 45,040 | 137,949 | 138,140 | 245,254
Fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 80,459 | 97,370 | 170,402 | 188,752
Other investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | (37,580) | 31,232 | (39,700) | 38,128
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 2,263 | 3,197 | 4,387 | 5,525
Mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 3,660 | 3,689 | 7,713 | 6,752
Cash and cash equivalents |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 2,392 | 8,138 | 7,323 | 13,940
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 366 | $ 1,108 | $ 1,863 | $ 5,002

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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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