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Net Income Per Share
12 Months Ended
Dec. 31, 2015
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):

 
 
2015
 
2014
 
2013
Net income attributable to shareholders
 
$
497,726

 
$
498,045

 
$
399,420

Weighted-average shares outstanding - basic
 
94,608

 
98,675

 
102,559

Net effect of various dilutive stock-based compensation awards
 
1,078

 
1,272

 
1,140

Weighted-average shares outstanding - diluted
 
95,686

 
99,947

 
103,699

Net income per share:
 
 
 
 
 
 
Basic
 
$
5.26

 
$
5.05

 
$
3.89

Diluted (a)
 
$
5.20

 
$
4.98

 
$
3.85



(a)
Stock-based compensation awards for the issuance of 658 shares, 294 shares, and 874 shares for the years ended December 31, 2015, 2014, and 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.