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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2014
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: 
 
 
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