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Investments (Details 10) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Investment Gains And Losses [Abstract] |  |
Other-than-temporary impairments on fixed maturity securities | $ 202,000 | $ 7,607,000
Portion of loss recognized in accumulated other comprehensive income (before taxes) | 0 | (7,221,000)
Net other-than-temporary impairment losses on fixed maturities recognized in earnings | 202,000 | 14,828,000
Impairment Losses On Equity Securities | 0 | (839,000)
Gain on investment activity | 21,680,000 | 22,312,000
Loss on investment activity | (11,212,000) | (7,504,000)
Other impairment losses | (1,626,000) | (5,843,000)
Derivatives And Other Investments Net | 85,731,000 | 50,222,000
Net gains (losses) | $ 94,371,000 | $ 43,520,000

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