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Weighted Average Common Shares
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Weighted Average Common Shares
Weighted Average Common 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,
 
 
2018
 
2017
 
2018
 
2017
Weighted average common shares for basic earnings per share
 
237,487

 
237,399

 
237,483

 
237,395

Effect of dilutive securities: unvested share awards
 
42

 
46

 
23

 
38

Weighted average common shares for diluted earnings per share
 
237,529

 
237,445

 
237,506

 
237,433