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Investments Other Than Temporary Impairments by Asset Type (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investment Holdings [Line Items]        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ (1,686) $ (8,891) $ (5,545) $ (17,691)
Residential Mortgage Backed Securities [Member]
       
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities 4 37 24 47
Other than Temporary Impairment Losses, Investments 0 (5,133) (2,156) (10,346)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (1,686) (3,758) (3,389) (7,345)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ (1,686) $ (8,891) $ (5,545) $ (17,691)