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Dividends (Tables)
9 Months Ended
Sep. 30, 2011
Dividends 
Dividends Paid
     Three months ended  
     March 31, 2011      June 30, 2011      September 30, 2011  

Cash dividend per common share

   $ .15625       $ .15750       $ .15880   

Total cash dividends paid

   $ 10,402,000       $ 10,500,000       $ 10,592,000   

Record date

     February 11         April 22         July 29   

Payment date

     March 4         May 13         August 19