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Earnings (Loss) Per Common Share
9 Months Ended
Sep. 30, 2011
Earnings (Loss) Per Common Share [Abstract] 
Earnings (Loss) Per Common Share

2.    Earnings (Loss) Per Common Share

Basic earnings (loss) per common share is based on the weighted average number of common shares outstanding for the three months and nine months ended September 30, 2011 and 2010. Diluted earnings (loss) per share is based on the weighted average number of common shares outstanding, plus the incremental shares that would have been outstanding upon the assumed exercise of all potentially dilutive stock options and other stock units subject to anti-dilution limitations.