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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
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: 
 
 
2014
 
2013
 
2012
Basic weighted average common shares outstanding
 
134,934,892

 
132,894,179

 
131,447,895

Effect of dilutive securities - stock awards
 
2,416,417

 
2,436,014

 
1,869,155

Diluted weighted average common shares outstanding
 
137,351,309

 
135,330,193

 
133,317,050

 
For the years ended December 31, 2014, 2013, and 2012, 1.2 million, 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.