Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

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

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):

	2013		2012		2011
Net income attributable to shareholders	$	399,420	$	506,332	$	598,810
Weighted-average shares outstanding - basic	102,559		109,240		114,025
Net effect of various dilutive stock-based compensation awards	1,140		1,837		1,907
Weighted-average shares outstanding - diluted	103,699		111,077		115,932
Net income per share:
Basic	$	3.89	$	4.64	$	5.25
Diluted (a)	$	3.85	$	4.56	$	5.17

(a) Stock-based compensation awards for the issuance of 874 shares, 1,424 shares, and 1,051 shares for the years ended December 31, 2013, 2012, and 2011, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.