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Investments (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Fixed Income Securities [Member] |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |
Beginning of period | $ 298,096 | $ 114,515 | $ 284,338 | $ 118,498
Change in unrealized investment gains and losses | 61,869 | 53,217 | 75,867 | 52,976
Reclassification of net realized investment (gains) losses to net income | (3,861) | (3,765) | (4,101) | (7,507)
End of period | 356,104 | 163,967 | 356,104 | 163,967
Equity Securities [Member] |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |
Beginning of period | 2,238 | 2,497 | 2,408 | 2,139
Change in unrealized investment gains and losses | 882 | 391 | 727 | 749
Reclassification of net realized investment (gains) losses to net income | (2,577) | (3) | (2,592) | (3)
End of period | $ 543 | $ 2,885 | $ 543 | $ 2,885

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