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Earnings Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings per Share
The following table shows the information used in the calculation of our share counts for basic and diluted earnings per share:
 
For the Three Months Ended
 
March 31,
 
2014
 
2015
Weighted average common shares outstanding
    for basic calculation
135,729,809

 
136,981,193

Add: Effect of stock options and restricted stock
—

 
—

Weighted average common shares outstanding
    for diluted calculation
135,729,809

 
136,981,193


Basic earnings per common share are calculated by dividing net income (loss) by the weighted average number of common shares outstanding. Diluted earnings per share are calculated by dividing net income (loss) by the sum of the weighted average number of common shares outstanding plus the additional common shares that would have been outstanding if potentially dilutive securities had been issued.
The weighted average common shares outstanding for the diluted earnings per share calculation excludes consideration of stock options covering 1,131,088 and 1,980,607 shares in the three months ended March 31, 2014 and 2015 respectively, as these shares are anti-dilutive.