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8. Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 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
 
 
March 31,
 
 
2015
 
2014
 
Basic weighted average shares outstanding
29,092

 
28,791

 
Effect of potentially dilutive stock options and restricted stock awards
197

 
268

 
Diluted weighted average common shares
29,289

 
29,059

 
Anti-dilutive shares
106

 
94