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Income Per Share
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Income Per Share
Income (Loss) per Share

Basic income (loss) per share is based upon the weighted average number of common shares outstanding during the period. Dilutive income (loss) per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued using the treasury stock method.

A reconciliation of the number of shares used for the basic and diluted income (loss) per share calculations is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
Shares in millions
2015
 
2014
 
2015
 
2014
Basic weighted average common shares outstanding
144

 
145

 
144

 
146

Stock options and restricted shares

 

 

 

Diluted weighted average common shares outstanding
144

 
145

 
144

 
146



For purposes of applying the two-class method in computing income (loss) per share, there were $0.6 million and $0.9 million net earnings allocated to participating securities, or a negligible amount per share, for the three and six months ended June 30, 2015, respectively. There were no net earnings allocated to participating securities for each of the three and six months ended June 30, 2014. The diluted income (loss) per share calculation did not include 3.8 million and 3.6 million antidilutive weighted average shares for the three and six months ended June 30, 2015, respectively. The diluted income (loss) per share calculation did not include 3.1 million and 2.5 million antidilutive weighted average shares for the three and six months ended June 30, 2014, respectively.