Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Gains (Losses)	Treasury Stock
Beginning balance at Dec. 31, 2008	$ 3,361,485	$ 1,439	$ 1,957,041	$ 1,516,908	$ 510	$ (114,413)
Beginning Balance, shares at Dec. 31, 2008		143,917,850				4,916,800
Net income	1,376,219			1,376,219
Dividends to stockholders	(1,112,058)			(1,112,058)
Anti-dilution adjustment paid to stock plan participants	(4,571)			(4,571)
Stock options exercised	1,069		1,069
Stock options exercised, shares		25,128
Stock-based compensation, net of tax	7,403		7,403
Net gain (loss) on foreign currency forward exchange contracts	1,563				1,563
Net gain (loss) on investments	(468)				(468)
Ending balance at Dec. 31, 2009	3,630,642	1,439	1,965,513	1,776,498	1,605	(114,413)
Ending Balance, shares at Dec. 31, 2009		143,942,978				4,916,800
Net income	955,457			955,457
Dividends to stockholders	(729,888)			(729,888)
Anti-dilution adjustment paid to stock plan participants	(3,072)			(3,072)
Stock options exercised	31		31
Stock options exercised, shares		646
Stock-based compensation, net of tax	7,006		7,006
Net gain (loss) on foreign currency forward exchange contracts	1,170				1,170
Net gain (loss) on investments	366				366
Ending balance at Dec. 31, 2010	3,861,712	1,439	1,972,550	1,998,995	3,141	(114,413)
Ending Balance, shares at Dec. 31, 2010		143,943,624				4,916,800
Net income	962,542			962,542
Dividends to stockholders	(486,595)			(486,595)
Anti-dilution adjustment paid to stock plan participants	(2,632)			(2,632)
Stock options exercised	0
Stock options exercised, shares	3,376	385
Stock-based compensation, net of tax	5,819		5,819
Net gain (loss) on foreign currency forward exchange contracts	(7,353)				(7,353)
Net gain (loss) on investments	(430)				(430)
Ending balance at Dec. 31, 2011	$ 4,333,063	$ 1,439	$ 1,978,369	$ 2,472,310	$ (4,642)	$ (114,413)
Ending Balance, shares at Dec. 31, 2011		143,944,009				4,916,800