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Weighted Average Common Shares (Tables)
9 Months Ended
Sep. 30, 2018
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,
 
 
2018
 
2017
 
2018
 
2017
Weighted average common shares for basic earnings per share
 
237,511

 
237,421

 
237,492

 
237,404

Effect of dilutive securities: unvested share awards
 
51

 
39

 
34

 
41

Weighted average common shares for diluted earnings per share
 
237,562

 
237,460

 
237,526

 
237,445