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INVESTMENTS (DETAILS 6) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 96,858 | $ 122,745 | $ 196,738 | $ 215,824
Investment expenses | (8,314) | (7,878) | (16,087) | (18,214)
Net investment income | 88,544 | 114,867 | 180,651 | 197,610
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 77,998 | 78,523 | 144,086 | 151,480
Other Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 14,102 | 32,492 | 45,037 | 49,252
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 2,674 | 5,301 | 4,350 | 7,587
Mortgage loans [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 281 | 0 | 294 | 0
Cash And Cash Equivalents [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 1,678 | 6,183 | 2,777 | 7,046
Short-term Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 125 | $ 246 | $ 194 | $ 459

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