Consolidated Statements of Equity and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	Total		Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock in Treasury [Member]		Non-Controlling Interest [Member]
Beginning balance at Dec. 31, 2009	$ 2,188,507		$ 265	$ 2,587,727	$ 1,578,084	$ (2,060)	$ (1,975,509)
Beginning balance (in shares) at Dec. 31, 2009			264,831,000				(82,222,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans (in shares)			12,800,000
Shares issued under stock-based compensation plans	353,555		12	353,543
Stock-based compensation expense	100,908			100,908
Common stock issued under employee stock purchase plan (in shares)			361,000
Common stock issued under employee stock purchase plan	17,365		1	17,364
Tax benefit from employer stock plans	51,544			51,544
Stock repurchases, net (in shares)							(8,157,000)
Stock repurchases, net	(433,739)			1,100			(434,839)
Restricted shares turned in for tax withholding (in shares)	(123,489)						(123,000)
Restricted shares turned in for tax withholding	(6,298)						(6,298)
Purchase of non-controlling interest	8,221								8,221
Unrealized gain on forward contracts net of reclassification adjustments and net of taxes	1,743					1,743
Unrealized gain on available-for-sale securities, net of tax	4,390					4,390
Foreign currency translation adjustments	(702)					(702)
Other comprehensive loss on pension liability, net of tax	(1,348)					(1,348)
Net income	276,441				277,065				(624)
Ending balance at Dec. 31, 2010	2,560,588	[1]	278	3,112,186	1,855,149	2,023	(2,416,645)	[1]	7,597
Ending balance (in shares) at Dec. 31, 2010			277,992,000				(90,502,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans (in shares)			4,472,000
Shares issued under stock-based compensation plans	125,606		4	125,602
Stock-based compensation expense	89,422			89,422
Common stock issued under employee stock purchase plan (in shares)			310,000
Common stock issued under employee stock purchase plan	21,099		1	21,098
Tax benefit from employer stock plans	50,003			50,003
Stock repurchases, net (in shares)							(6,276,000)
Stock repurchases, net	(424,849)						(424,849)
Restricted shares turned in for tax withholding (in shares)	(182,203)						(182,000)
Restricted shares turned in for tax withholding	(13,262)						(13,262)
Purchase of non-controlling interest	(20,163)			(13,258)					(6,905)
Unrealized gain on forward contracts net of reclassification adjustments and net of taxes	(11,259)					(11,259)
Unrealized gain on available-for-sale securities, net of tax	1,636					1,636
Foreign currency translation adjustments	(4,595)					(4,595)
Other comprehensive loss on pension liability, net of tax	634					634
Net income	355,630				356,322				(692)
Ending balance at Dec. 31, 2011	2,730,490	[1]	283	3,385,053	2,211,471	(11,561)	(2,854,756)	[1]
Ending balance (in shares) at Dec. 31, 2011			282,774,000				(96,960,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under stock-based compensation plans (in shares)			3,983,000
Shares issued under stock-based compensation plans	108,405		3	108,402
Stock-based compensation expense	145,967			145,967
Common stock issued under employee stock purchase plan (in shares)			366,000
Common stock issued under employee stock purchase plan	24,889		1	24,888
Tax benefit from employer stock plans	24,839			24,839
Stock repurchases, net (in shares)							(3,551,000)
Stock repurchases, net	(251,008)						(251,008)
Restricted shares turned in for tax withholding (in shares)	(269,745)						(270,000)
Restricted shares turned in for tax withholding	(20,170)						(20,170)
Purchase of non-controlling interest	1,962			1,962
Unrealized gain on forward contracts net of reclassification adjustments and net of taxes	5,164					5,164
Unrealized gain on available-for-sale securities, net of tax	160					160
Foreign currency translation adjustments	2,457					2,457
Other comprehensive loss on pension liability, net of tax	(3,925)					(3,925)
Net income	352,547				352,547
Ending balance at Dec. 31, 2012	$ 3,121,777		$ 287	$ 3,691,111	$ 2,564,018	$ (7,705)	$ (3,125,934)
Ending balance (in shares) at Dec. 31, 2012			287,123,000				(100,781,000)

[1] Amounts do not sum due to rounding.