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8. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Basic weighted average shares outstanding
29,444

 
29,195

 
29,402

 
29,141

Effect of potentially dilutive stock options and restricted stock awards
227

 
244

 
190

 
231

Diluted weighted average common shares
29,671

 
29,439

 
29,592

 
29,372

Anti-dilutive shares
50

 
44

 
77

 
112