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Investments (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Proceeds received, Fixed maturity securities | $ 191,155 | $ 246,127 | $ 470,684 | $ 457,411
Proceeds received, Equity securities | 1,970 |  | 2,894 |
Fixed Maturity Securities [Member] |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 10,528 | 19,272 | 27,891 | 28,954
Gross losses realized | (139) | (9) | (11,968) | (92)
Equity Securities [Member] |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 67 |  | 84 |
Gross losses realized | $ (157) |  | $ (233) |

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