Consolidated Statements Of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Stock Units [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance, value at Dec. 31, 2014	$ 10,195	$ 888,293	$ 5,066	$ 1,675,299	$ (8,071)	$ (2,453,266)	$ 73	$ 117,589
Balance, shares at Dec. 31, 2014	101,947
Net income (loss)				192,078			57	192,135
Other comprehensive loss, net					(34,194)			(34,194)
Repurchases of common stock						(412,172)		(412,172)
Stock split enacted through stock dividend				(1,518,264)		1,518,264
Shares retired, value				(30,757)		30,757
Shares retired, shares	(346)
Common stock issued under stock plans, including excess tax benefit, value	$ 63	32,700						32,763
Common stock issued under stock plans, including excess tax benefit, shares	636
Deferred stock units activity		(258)	258
Share-based compensation cost		19,799	85					19,884
Balance, value at Dec. 31, 2015	$ 10,258	940,534	5,409	318,356	(42,265)	(1,316,417)	130	(83,995)
Balance, shares at Dec. 31, 2015	102,237
Net income (loss)				222,045			9	222,054
Other comprehensive loss, net					(788)			(788)
Repurchases of common stock						(317,026)		(317,026)
Common stock issued under stock plans, including excess tax benefit, value	$ 76	51,904						51,980
Common stock issued under stock plans, including excess tax benefit, shares	1,104
Deferred stock units activity		(343)	14					(329)
Share-based compensation cost		19,800	91					19,891
Balance, value at Dec. 31, 2016	$ 10,334	1,011,895	5,514	540,401	(43,053)	(1,633,443)	139	$ (108,213)
Balance, shares at Dec. 31, 2016	103,341							103,341
Net income (loss)				263,144			125	$ 263,269
Other comprehensive loss, net					6,583			6,583
Repurchases of common stock						(278,085)		(278,085)
Common stock issued under stock plans, including excess tax benefit, value	$ 94	39,005						39,099
Common stock issued under stock plans, including excess tax benefit, shares	934
Deferred stock units activity		(350)	338					(12)
Share-based compensation cost		23,381	136					23,517
Balance, value at Dec. 31, 2017	$ 10,428	$ 1,073,931	$ 5,988	$ 803,545	$ (36,470)	$ (1,911,528)	$ 264	$ (53,842)
Balance, shares at Dec. 31, 2017	104,275							104,275