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Investments (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investment Gains And Losses [Abstract]        
Other-than-temporary impairments on fixed maturity securities $ 1,996,000 $ 11,911,000 $ 11,562,000 $ 19,049,000
Portion of loss recognized in accumulated other comprehensive income (before taxes) (559,000) 3,089,000 (7,618,000) 3,381,000
Net other-than-temporary impairment losses on fixed maturities recognized in earnings 2,555,000 8,822,000 19,180,000 15,668,000
Impairment Losses On Equity Securities 0 0 (3,025,000) (3,680,000)
Gain on investment activity 53,173,000 34,840,000 102,078,000 92,423,000
Loss on investment activity (6,668,000) (7,182,000) (23,090,000) (20,749,000)
Other impairment losses (10,301,000) (2,370,000) (14,382,000) (4,980,000)
Derivatives And Other Investments Net 42,404,000 (156,066,000) 100,973,000 (35,938,000)
Net gains (losses) $ 76,053,000 $ (139,600,000) $ 143,374,000 $ 11,408,000