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Weighted Average Common Shares (Tables)
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
The following table provides a reconciliation of the weighted average number of common shares used in the calculation of basic and diluted earnings per share (in thousands): 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Weighted average common shares for basic earnings per share
 
237,421

 
237,347

 
237,404

 
237,329

Effect of dilutive securities: unvested share awards
 
39

 
49

 
41

 
40

Weighted average common shares for diluted earnings per share
 
237,460

 
237,396

 
237,445

 
237,369