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Comprehensive Income (Tables)
 6 Months Ended
Jun. 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   7,215   172,329   1,501   181,045
Balance, June 30, 2012 $ 237,010 $ 1,591,647 $ (29,459) $ 1,799,198

    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   35,894   115,574   572   152,040
Balance, June 30, 2011 $ 291,189 $ 767,023 $ (13,988) $ 1,044,224