Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock, at Cost	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss), Net	Retained Earnings
Balance at Dec. 31, 2009	$ 3,712,554	$ 1,905	$ (1,282,054)	$ 1,750,113	$ 41,406	$ 3,201,184
Common stock, issued (in shares) at Dec. 31, 2009		190,500,000
Stockholders' Equity [Roll Forward]
Net earnings	438,616					438,616
Other comprehensive Income (loss), net of tax	(325)				(325)
Employee stock plans activity	48,321	10	13,598	34,713
Employee stock plans activity (in shares)		1,000,000
Treasury shares acquired	0		0
Dividends declared						0
Balance at Dec. 31, 2010	4,199,166	1,915	(1,268,456)	1,784,826	41,081	3,639,800
Common stock, issued (in shares) at Dec. 31, 2010		191,500,000
Stockholders' Equity [Roll Forward]
Net earnings	543,105					543,105
Other comprehensive Income (loss), net of tax	19,388				19,388
Employee stock plans activity	77,055	20	12,866	64,169
Employee stock plans activity (in shares)		2,000,000
Treasury shares acquired	(327,723)		(327,723)
Dividends declared						0
Balance at Dec. 31, 2011	4,510,991	1,935	(1,583,313)	1,848,995	60,469	4,182,905
Common stock, issued (in shares) at Dec. 31, 2011	193,469,000	193,500,000
Stockholders' Equity [Roll Forward]
Net earnings	487,063					487,063
Other comprehensive Income (loss), net of tax	8,751				8,751
Employee stock plans activity	112,482	36	(9,436)	121,882
Employee stock plans activity (in shares)		3,600,000
Treasury shares acquired	(328,000)		(328,000)
Dividends declared	(68,372)					(68,372)
Balance at Dec. 31, 2012	$ 4,722,915	$ 1,971	$ (1,920,749)	$ 1,970,877	$ 69,220	$ 4,601,596
Common stock, issued (in shares) at Dec. 31, 2012	197,080,000	197,100,000