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Capital Stock (Details) - $ / shares
Jun. 30, 2016
Dec. 31, 2015
Capital stock shares authorized (in shares) 1,020,000,000  
Common stock shares authorized (in shares) 1,000,000,000  
Common stock shares par value (in dollars per share) $ 0.01  
Cumulative preferred stock shares authorized (in shares) 20,000,000  
Cumulative preferred stock par value (in dollars per share) $ 0.01  
Total common stock issued (in shares) 430,681,657 430,262,869
Total common stock outstanding (in shares) 430,681,491 430,262,703
Treasury stock (in shares) 166 166