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Net Income Per Share
 12 Months Ended
Dec. 31, 2016
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):
 
 
2016
 
2015
 
2014
Net income attributable to shareholders
 
$
522,750

 
$
497,726

 
$
498,045

Weighted-average shares outstanding - basic
 
90,960

 
94,608

 
98,675

Net effect of various dilutive stock-based compensation awards
 
1,073

 
1,078

 
1,272

Weighted-average shares outstanding - diluted
 
92,033

 
95,686

 
99,947

Net income per share:
 
 
 
 
 
 
Basic
 
$
5.75

 
$
5.26

 
$
5.05

Diluted (a)
 
$
5.68

 
$
5.20

 
$
4.98



(a)
Stock-based compensation awards for the issuance of 766 shares, 658 shares, and 294 shares for the years ended December 31, 2016, 2015, and 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.