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Investments Cummulative Credit Loss Portion of Other Than Temporary Impairment Recognized in Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ (134,027) $ (119,095)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment (1,761) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (1,048) (2,881)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 7,023 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ (129,813) $ (121,976)