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9. Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2013
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,
 
 
2013
 
2012
Basic weighted average shares outstanding
 
28,494

 
28,201

Effect of potentially dilutive stock options and restricted stock awards
 
323

 
352

Diluted weighted average common shares
 
28,817

 
28,553

Anti-dilutive shares
 
92

 
112