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8. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
Basic weighted average shares outstanding
28,312

 
28,072

 
28,255

 
27,997

Effect of potentially dilutive stock options and restricted stock awards
333

 
384

 
354

 
457

Diluted weighted average common shares
28,645

 
28,456

 
28,609

 
28,454

Anti-dilutive shares
94

 
59

 
106

 
37