Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Deferred Stock Units	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2017			104,275
Balance beginning of period at Dec. 31, 2017	$ (53,842)	$ (12,648)	$ 10,428	$ 1,073,931	$ 5,988	$ 803,545	$ (12,648)	$ (36,470)	$ (1,911,528)	$ 264
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	377,047					377,031				16
Other comprehensive loss, net	(5,321)							(5,321)
Repurchases of common stock, net	(377,371)								(377,371)
Common stock issued under stock plans, net (in shares)			812
Common stock issued under stock plans, net	37,745		$ 81	39,756	(2,092)
Deferred stock units activity	0			(385)	385
Share-based compensation cost	25,157			24,914	243
Balance (in shares) at Dec. 31, 2018			105,087
Balance end of period at Dec. 31, 2018	(9,233)		$ 10,509	1,138,216	4,524	1,167,928		(41,791)	(2,288,899)	280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	427,792					427,720				72
Other comprehensive loss, net	(4,391)							(4,391)
Repurchases of common stock, net	(311,644)								(311,644)
Common stock issued under stock plans, net (in shares)			624
Common stock issued under stock plans, net	36,023		$ 62	36,551	(590)
Deferred stock units activity	0			(324)	324
Share-based compensation cost	$ 39,278			39,074	204
Balance (in shares) at Dec. 31, 2019	105,711		105,711
Balance end of period at Dec. 31, 2019	$ 177,825	$ (1,829)	$ 10,571	1,213,517	4,462	1,595,648	$ (1,829)	(46,182)	(2,600,543)	352
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	582,131					581,776				355
Other comprehensive loss, net	(7,433)							(7,433)		0
Repurchases of common stock, net	(199,347)								(199,347)
Common stock issued under stock plans, net (in shares)			746
Common stock issued under stock plans, net	50,497		$ 75	51,368	(946)				0
Deferred stock units activity	0			(894)	894
Share-based compensation cost	$ 30,951			30,858	93
Balance (in shares) at Dec. 31, 2020	106,457		106,457
Balance end of period at Dec. 31, 2020	$ 632,795		$ 10,646	$ 1,294,849	$ 4,503	$ 2,175,595		$ (53,615)	$ (2,799,890)	$ 707