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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2013
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
March 31,
 
2013
 
2012
Basic weighted average common shares outstanding
132,306,735

 
130,550,681

Effect of dilutive securities
2,686,322

 
3,131,095

Diluted weighted average common shares outstanding
134,993,057

 
133,681,776