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INVESTMENTS (DETAILS 6) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 53,562 | $ 75,856 | $ 250,300 | $ 291,679
Investment expenses | (7,877) | (9,294) | (23,964) | (27,508)
Net investment income | 45,685 | 66,562 | 226,336 | 264,171
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 75,980 | 74,996 | 220,066 | 226,475
Other Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | (27,421) | (3,384) | 17,616 | 45,868
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 3,445 | 2,022 | 7,795 | 9,609
Mortgage loans [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 482 | 0 | 776 | 0
Cash And Cash Equivalents [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 993 | 2,081 | 3,770 | 9,127
Short-term Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 83 | $ 141 | $ 277 | $ 600

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