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Net Income per Share (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the computation of net income per share on a basic and diluted basis (shares in thousands):
 
 
Quarter Ended
 
Six Months Ended
 
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Net income attributable to shareholders
 
$
169,915

 
$
99,722

 
$
309,009

 
$
214,459

Weighted-average shares outstanding - basic
 
87,802

 
88,876

 
87,878

 
89,079

Net effect of various dilutive stock-based compensation awards
 
850

 
961

 
963

 
1,067

Weighted-average shares outstanding - diluted
 
88,652

 
89,837

 
88,841

 
90,146

Net income per share:
 
 

 
 

 
 
 
 
Basic
 
$
1.94

 
$
1.12

 
$
3.52

 
$
2.41

Diluted (a)
 
$
1.92

 
$
1.11

 
$
3.48

 
$
2.38



(a)
Stock-based compensation awards for the issuance of 915 and 515 shares for the second quarter and first six months of 2018 and 432 and 328 shares for the second quarter and first six months of 2017, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.