Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Deferred Stock Units	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2015		102,237
Balance beginning of period at Dec. 31, 2015	$ (83,995)	$ 10,258	$ 940,534	$ 5,409	$ 318,356	$ (42,265)	$ (1,316,417)	$ 130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	222,054				222,045			9
Other comprehensive income (loss), net	(788)					(788)
Repurchases of common stock, net	(317,026)						(317,026)
Common stock issued under stock plans, including excess tax benefit (in shares)		1,104
Common stock issued under stock plans, including excess tax benefit	51,980	$ 76	51,904
Deferred stock units activity	(329)		(343)	14
Share-based compensation cost	19,891		19,800	91
Balance (in shares) at Dec. 31, 2016		103,341
Balance end of period at Dec. 31, 2016	(108,213)	$ 10,334	1,011,895	5,514	540,401	(43,053)	(1,633,443)	139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	263,269				263,144			125
Other comprehensive income (loss), net	6,583					6,583
Repurchases of common stock, net	(278,085)						(278,085)
Common stock issued under stock plans, including excess tax benefit (in shares)		934
Common stock issued under stock plans, including excess tax benefit	39,099	$ 94	39,005
Deferred stock units activity	(12)		(350)	338
Share-based compensation cost	$ 23,517		23,381	136
Balance (in shares) at Dec. 31, 2017	104,275	104,275
Balance end of period at Dec. 31, 2017	$ (53,842)	$ 10,428	1,073,931	5,988	803,545	(36,470)	(1,911,528)	264
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes (Note 2)	(12,648)				(12,648)
Net income	377,047				377,031			16
Other comprehensive income (loss), net	(5,321)					(5,321)
Repurchases of common stock, net	(377,371)						(377,371)
Common stock issued under stock plans, including excess tax benefit (in shares)		812
Common stock issued under stock plans, including excess tax benefit	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	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