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Net Income Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Net Income Per Share [Text Block] Net Income Per Share

The following table presents the computation of net income per share on a basic and diluted basis for the years ended December 31 (shares in thousands):
 
 
2018
 
2017
 
2016
Net income attributable to shareholders
 
$
716,195

 
$
402,176

 
$
522,815

Weighted-average shares outstanding - basic
 
87,476

 
88,681

 
90,960

Net effect of various dilutive stock-based compensation awards
 
968

 
1,085

 
1,073

Weighted-average shares outstanding - diluted
 
88,444

 
89,766

 
92,033

Net income per share:
 
 
 
 
 
 
Basic
 
$
8.19

 
$
4.54

 
$
5.75

Diluted (a)
 
$
8.10

 
$
4.48

 
$
5.68



(a)
Stock-based compensation awards for the issuance of 651 shares, 380 shares, and 766 shares for the years ended December 31, 2018, 2017, and 2016, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.