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Weighted Average Common Shares (Tables)
6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
Weighted average common shares for basic earnings per share
 
237,399

 
237,325

 
237,395

 
237,320

Effect of dilutive securities: unvested share awards
 
46

 
38

 
38

 
29

Weighted average common shares for diluted earnings per share
 
237,445

 
237,363

 
237,433

 
237,349