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Earnings Per Share
 3 Months Ended
Mar. 31, 2014
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,
 
 
2013
 
2014
Weighted average common shares outstanding
    for basic calculation
 
134,645,729

 
135,729,809

Add: Effect of stock options and restricted stock
 
186,829

 
—

Weighted average common shares outstanding
    for diluted calculation
 
134,832,558

 
135,729,809


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 1,594,615 shares in the three months ended March 31, 2013, and 1,131,088 shares in the three months ended March 31, 2014, as the exercise prices were greater than the weighted average market price of our common stock for the applicable period.