Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Common Stock in Treasury	Non-Controlling Interest
Beginning balance at Dec. 31, 2010	$ 2,560,588	$ 278	$ 3,112,186	$ 1,855,149	$ 2,023	$ (2,416,645)	$ 7,597
Beginning balance (in shares) at Dec. 31, 2010		277,992,000
Treasury Stock, Shares						96,960,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans	125,606	4	125,602	0	0	0	0
Shares issued under stock-based compensation plans (in shares)		4,472,000				0
Stock-based compensation expense	89,422	0	89,422	0	0	0	0
Common stock issued under employee stock purchase plan	21,099	1	21,098	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)		310,000				0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	50,003	0	50,003	0	0	0	0
Stock repurchases, net	(424,849)	0	0	0	0	(424,849)	0
Stock repurchases, net (in shares)	(6,275,470)	0				(6,276,000)
Restricted shares turned in for tax withholding	(13,262)	0	0	0	0	(13,262)	0
Restricted shares turned in for tax withholding (in shares)	(182,203)	0				(182,000)
Purchase of non-controlling interest	(20,163)	0	(13,258)	0	0	0	(6,905)
Other comprehensive loss, net of tax	(13,584)	0	0	0	(13,584)	0	0
Net income	355,630	0	0	356,322	0	0	(692)
Ending balance at Dec. 31, 2011	2,730,490	283	3,385,053	2,211,471	(11,561)	(2,854,756)	0
Ending balance (in shares) at Dec. 31, 2011		282,774,000
Treasury Stock, Shares	100,781,000					100,781,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans	108,405	3	108,402	0	0	0	0
Shares issued under stock-based compensation plans (in shares)		3,983,000				0
Stock-based compensation expense	145,967	0	145,967	0	0	0	0
Common stock issued under employee stock purchase plan	24,889	1	24,888	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)		366,000				0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	24,839	0	24,839	0	0	0	0
Stock repurchases, net	(251,008)	0	0	0	0	(251,008)	0
Stock repurchases, net (in shares)	(3,550,817)	0				(3,551,000)
Restricted shares turned in for tax withholding	(20,170)	0	0	0	0	(20,170)	0
Restricted shares turned in for tax withholding (in shares)	(269,745)	0				(270,000)
Other	1,962	0	1,962	0	0	0	0
Other comprehensive loss, net of tax	3,856	0	0	0	3,856	0	0
Net income	352,547	0	0	352,547	0	0	0
Ending balance at Dec. 31, 2012	3,121,777	287	3,691,111	2,564,018	(7,705)	(3,125,934)	0
Ending balance (in shares) at Dec. 31, 2012		287,123,000
Treasury Stock, Shares	107,789,000					107,789,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans	73,655	3	73,652	0	0	0	0
Shares issued under stock-based compensation plans (in shares)		3,545,000				0
Stock-based compensation expense	179,098	0	179,098	0	0	0	0
Common stock issued under employee stock purchase plan	30,145	1	30,144	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)		410,000				0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(620)	0	(620)	0	0	0	0
Stock repurchases, net	(406,326)	0	0	0	0	(406,326)	0
Stock repurchases, net (in shares)	(6,563,986)	0				(6,564,000)
Restricted shares turned in for tax withholding	(31,013)	0	0	0	0	(31,013)	0
Restricted shares turned in for tax withholding (in shares)	(444,657)	0				(444,000)
Other	912	0	912	0	0	0	0
Other comprehensive loss, net of tax	12,656	0	0	0	12,656	0	0
Net income	339,523	0	0	339,523	0	0	0
Ending balance at Dec. 31, 2013	$ 3,319,807	$ 291	$ 3,974,297	$ 2,903,541	$ 4,951	$ (3,563,273)	$ 0
Ending balance (in shares) at Dec. 31, 2013		291,078,000