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Weighted-Average Shares (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Calculation of Weighted-Average Shares
Weighted-average shares were calculated as follows (in thousands):
 
Three-months Ended
 
Nine-months Ended
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
Basic weighted-average common shares outstanding
172,189

 
173,234

 
172,613

 
173,052

Effect of dilutive stock options
5,056

 
6,120

 
5,408

 
6,072

Weighted-average common and common-equivalent shares outstanding
177,245

 
179,354

 
178,021

 
179,124