Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

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):

	2011		2010		2009
Net income attributable to shareholders	$	598,810	$	479,630	$	123,512
Net income per share:
Basic	$	5.25	$	4.06	$	1.03
Diluted (a)	$	5.17	$	4.01	$	1.03
Weighted average shares outstanding - basic	114,025		117,997		119,800
Net effect of various dilutive stock-based compensation awards	1,907		1,580		689
Weighted average shares outstanding - diluted	115,932		119,577		120,489

(a) Stock-based compensation awards for the issuance of 1,051 shares, 3,257 shares, and 3,851 shares for the years ended December 31, 2011, 2010, and 2009, respectively, were excluded from the computation of net income per share on a diluted basis as their effect is anti-dilutive.