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INVESTMENTS (DETAILS 7) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 98,927 | $ 96,858 | $ 156,495 | $ 196,738
Investment expenses | (7,197) | (8,314) | (15,599) | (16,087)
Net investment income | 91,730 | 88,544 | 140,896 | 180,651
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 77,621 | 77,998 | 153,596 | 144,086
Other Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 14,401 | 14,102 | (12,477) | 45,037
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 3,065 | 2,674 | 8,210 | 4,350
Mortgage loans [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 1,807 | 281 | 3,492 | 294
Cash And Cash Equivalents [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 1,868 | 1,678 | 3,303 | 2,777
Short-term Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 165 | $ 125 | $ 371 | $ 194

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