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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Reconciliation of the average shares outstanding used to compute basic and diluted 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,
 
2015
 
2014
 
2015
 
2014
Basic weighted average common shares outstanding
136,164,053

 
135,222,411

 
135,983,603

 
134,803,784

Effect of dilutive securities
1,244,051

 
2,375,393

 
1,347,851

 
2,802,227

Diluted weighted average common shares outstanding
137,408,104

 
137,597,804

 
137,331,454

 
137,606,011