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Net Income Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Net Income Per Share [Text Block]
Net Income Per Share

The following table sets forth the computation of net income per share on a basic and diluted basis for the years ended December 31 (shares in thousands):

 
 
2012
 
2011
 
2010
 
Net income attributable to shareholders
 
$
506,332

 
$
598,810

 
$
479,630

 
Weighted-average shares outstanding - basic
 
109,240

 
114,025

 
117,997

 
Net effect of various dilutive stock-based compensation awards
 
1,837

 
1,907

 
1,580

 
Weighted-average shares outstanding - diluted
 
111,077

 
115,932

 
119,577

 
Net income per share:
 
 
 
 
 
 
 
Basic
 
$
4.64

 
$
5.25

 
$
4.06

 
Diluted (a)
 
$
4.56

 
$
5.17

 
$
4.01

 


(a)
Stock-based compensation awards for the issuance of 1,424 shares, 1,051 shares, and 3,257 shares for the years ended December 31, 2012, 2011, and 2010, respectively, were excluded from the computation of net income per share on a diluted basis as their effect is anti-dilutive.