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Repurchase of Common Stock - Effects on Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2021
Stockholders' Equity Note [Abstract]  
Common stock repurchase
   

Three Months Ended

March 31

 
    2021     2020  
2020 Program            
Number of shares repurchased     -       -  
Cost of shares repurchased                
   Allocated to retained earnings   $ -     $ -  
   Allocated to capital     -       -  
      Total cost of shares repurchased   $ -     $ -  
                 
2008 Program                
Number of shares repurchased     -       978  
Cost of shares repurchased                
   Allocated to retained earnings   $ -     $ 5,760  
   Allocated to capital     -       480  
      Total cost of shares repurchased   $ -     $ 6,240