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Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2012
Comprehensive Income [Abstract]  
Components Of Accumulated Other Comprehensive Income [Text Block]
    Accumulated Other Comprehensive Income (Loss), Net of Income Tax
     Accumulated         
     Currency  Unrealized  Pension and   
     Translation  Appreciation  Postretirement   
     Adjustments  of Securities  Benefits  Total
Balance, December 31, 2011 $ 229,795 $ 1,419,318 $ (30,960) $ 1,618,153
 Change in component during the period   43,463   488,194   1,837   533,494
Balance, September 30, 2012 $ 273,258 $ 1,907,512 $ (29,123) $ 2,151,647

    Accumulated Other Comprehensive Income (Loss), Net of Income Tax
     Accumulated         
     Currency  Unrealized  Pension and   
     Translation  Appreciation  Postretirement   
     Adjustments  of Securities  Benefits  Total
Balance, December 31, 2010 $ 255,295 $ 651,449 $ (14,560) $ 892,184
 Change in component during the period   (65,948)   468,275   1,280   403,607
Balance, September 30, 2011 $ 189,347 $ 1,119,724 $ (13,280) $ 1,295,791