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Earnings Per Share
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share

7. Earnings Per Share

The calculation of basic earnings per share excludes any dilutive effect of stock options, while diluted earnings per share includes the dilutive effect of options. The number of dilutive shares excluded from this calculation resulting from the antidilutive effect of options is 312,712 and 419,367 for the six months ended June 30, 2012 and 2011.