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INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net Investment Income [Line Items] |  |
Gross investment income | $ 107,573 | $ 105,857
Investment expenses | (6,574) | (7,193)
Net investment income | 100,999 | 98,664
Fixed maturities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 83,958 | 77,407
Other investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | 13,704 | 18,962
Equity securities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 1,758 | 3,478
Mortgage loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 3,125 | 2,477
Cash and cash equivalents |  |
Net Investment Income [Line Items] |  |
Gross investment income | 4,153 | 3,095
Short-term investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | $ 875 | $ 438

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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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