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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Weighted Average Common Shares Outstanding
A reconciliation of the weighted average common shares outstanding used in the basic and diluted EPS calculation for the three and nine months ended September 30 was as follows (in thousands):
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Weighted average common shares outstanding:
 
 
 
 
 
 
 
Basic EPS calculation
110,783

 
110,768

 
110,775

 
110,747

Effect of dilutive share-based awards
2

 
11

 
5

 
16

Diluted EPS calculation
110,785

 
110,779

 
110,780

 
110,763