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8. Earnings Per Share (Tables)
6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Basic weighted average shares outstanding
29,136

 
28,826

 
29,114

 
28,809

Effect of potentially dilutive stock options and restricted stock awards
245

 
266

 
224

 
267

Diluted weighted average common shares
29,381

 
29,092

 
29,338

 
29,076

Anti-dilutive shares
57

 
107

 
106

 
94