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Per Share Data (Tables)
 6 Months Ended
Jun. 30, 2011
Per Share Data  
Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share
     For the Three Months
Ended June 30,		      For the Six Months
Ended June 30,		  
     2011      2010      2011      2010  

Basic

      141,637         151,215         141,408         152,324   

Diluted

      147,677         157,461         147,614         158,539