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7. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Schedule of weighted-average common shares outstanding used to calculate basic and diluted earnings per shares and the anti-dilutive shares
The weighted average number of common shares outstanding used to calculate basic and diluted earnings per share, and the anti-dilutive shares that are excluded from the diluted earnings per share calculation are as follows (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2011
 
2010
 
2011
 
2010
Basic weighted average shares outstanding
28,072

 
27,697

 
27,997

 
27,616

Effect of potentially dilutive stock options and restricted stock awards
384

 
406

 
457

 
494

Diluted weighted average common shares
28,456

 
28,103

 
28,454

 
28,110

Anti-dilutive shares
59

 
132

 
37

 
117