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Weighted Average Common Shares (Tables)
9 Months Ended
Sep. 30, 2019
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,
 
 
2019
 
2018
 
2019
 
2018
Weighted average common shares for basic earnings per share
 
237,608

 
237,511

 
237,585

 
237,492

Effect of dilutive securities: unvested share awards
 

 
51

 

 
34

Weighted average common shares for diluted earnings per share (1)
 
237,608

 
237,562

 
237,585

 
237,526


(1) For the three and nine months ended September 30, 2019, 42 and 26, respectively, of unvested common shares were not included in the calculation of diluted earnings per share because to do so would have been antidilutive.