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Net Income Per Share
 12 Months Ended
Dec. 31, 2017
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):
 
 
2017
 
2016
 
2015
Net income attributable to shareholders
 
$
401,962

 
$
522,750

 
$
497,726

Weighted-average shares outstanding - basic
 
88,681

 
90,960

 
94,608

Net effect of various dilutive stock-based compensation awards
 
1,085

 
1,073

 
1,078

Weighted-average shares outstanding - diluted
 
89,766

 
92,033

 
95,686

Net income per share:
 
 
 
 
 
 
Basic
 
$
4.53

 
$
5.75

 
$
5.26

Diluted (a)
 
$
4.48

 
$
5.68

 
$
5.20



(a)
Stock-based compensation awards for the issuance of 380 shares, 766 shares, and 658 shares for the years ended December 31, 2017, 2016, and 2015, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.