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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
 
Three Months Ended 
 
 
March 31,
 
 
2018
 
2017
Weighted average shares outstanding - basic
 
82,253,470

 
82,349,024

Dilutive effect of share-based awards
 
102,578

 
95,434

Weighted average shares outstanding - diluted
 
82,356,048

 
82,444,458