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8. Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
Basic weighted average shares outstanding
28,250

 
28,014

 
28,226

 
27,959

Effect of potentially dilutive stock options and restricted stock awards
360

 
481

 
356

 
484

Diluted weighted average common shares
28,610

 
28,495

 
28,582

 
28,443

Anti-dilutive shares
91

 

 
93

 
37