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Earnings Per Share
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
The following is a reconciliation of the average shares outstanding used to compute basic and diluted earnings per share. 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Basic weighted average common shares outstanding
133,079,254

 
130,704,895

 
132,798,086

 
130,610,592

Effect of dilutive securities
2,225,247

 
1,897,397

 
2,343,861

 
1,966,103

Diluted weighted average common shares outstanding
135,304,501

 
132,602,292

 
135,141,947

 
132,576,695


For the three months ended September 30, 2013 and September 30, 2012, 1.4 million and 3.4 million, respectively, of common shares issuable upon the exercise of stock options were anti-dilutive and were excluded from the calculation of diluted earnings per share. For the nine months ended September 30, 2013 and September 30, 2012, 2.3 million and 3.4 million, respectively, of common shares issuable upon the exercise of stock options were anti-dilutive and were excluded from the calculation of diluted earnings per share.
No dividends were paid during each of the nine months ended September 30, 2013 and September 30, 2012.