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Net Income per Common Share (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Restricted Stock [Member]
       
Share-based compensation arrangement by share-based payment award [Line Items]        
Weighted average number of shares, outstanding for computation of diluted earnings per share (in shares) 0 100,000 100,000 200,000
Stock Option [Member]
       
Share-based compensation arrangement by share-based payment award [Line Items]        
Weighted average number of shares, outstanding for computation of diluted earnings per share (in shares) 90,000 300,000 200,000 400,000
Weighted average number of stock options, outstanding excluded from the computation of diluted earnings per share (in shares) 1,200,000 600,000 900,000 700,000