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Earnings Per Share
 6 Months Ended
Jun. 30, 2013
Notes to Financial Statements [Abstract]  
Earnings Per Share
3.
Earnings Per Share

Basic earnings per share were calculated using net earnings and the weighted average number of shares of common stock outstanding during the respective period. Diluted earnings per share were calculated using net earnings and the weighted average number of shares of common stock and potential common stock outstanding during the respective period. Potentially dilutive common stock consisted of stock options and the premium over the conversion price on Roper's senior subordinated convertible notes based upon the trading price of Roper's common stock. The effects of potential common stock were determined using the treasury stock method.  Weighted average shares outstanding are as shown below (in thousands):
 
 
 
Three months ended June 30,
  
Six months ended June 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
Basic shares outstanding
  
99,089
   
97,460
   
98,983
   
97,249
 
Effect of potential common stock:
                
Common stock awards
  
882
   
1,129
   
884
   
1,172
 
Senior subordinated convertible notes
  
191
   
1,030
   
204
   
1,079
 
Diluted shares outstanding
  
100,162
   
99,619
   
100,071
   
99,500
 

For the three and six month periods ended June 30, 2013 there were 579,350 and 587,350 outstanding stock options, respectively, that were not included in the determination of diluted earnings per share because doing so would have been antidilutive; this compares to 401,600 and 408,100 outstanding stock options, respectively, that would have been antidilutive for the three and six month periods ended June 30, 2012.