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Net Income Per Share
 12 Months Ended
Dec. 31, 2014
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):

 
 
2014
 
2013
 
2012
 
Net income attributable to shareholders
 
$
498,045

 
$
399,420

 
$
506,332

 
Weighted-average shares outstanding - basic
 
98,675

 
102,559

 
109,240

 
Net effect of various dilutive stock-based compensation awards
 
1,272

 
1,140

 
1,837

 
Weighted-average shares outstanding - diluted
 
99,947

 
103,699

 
111,077

 
Net income per share:
 
 
 
 
 
 
 
Basic
 
$
5.05

 
$
3.89

 
$
4.64

 
Diluted (a)
 
$
4.98

 
$
3.85

 
$
4.56

 


(a)
Stock-based compensation awards for the issuance of 294 shares, 874 shares, and 1,424 shares for the years ended December 31, 2014, 2013, and 2012, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.