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8. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Basic weighted average shares outstanding
29,195

 
28,884

 
29,141

 
28,834

Effect of potentially dilutive stock options and restricted stock awards
244

 
257

 
231

 
263

Diluted weighted average common shares
29,439

 
29,141

 
29,372

 
29,097

Anti-dilutive shares
44

 
117

 
112

 
111