Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income, Net	Accumulated Earnings	Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-09	$ (261)				$ (261)
Beginning Balance at Dec. 31, 2015	(132,400)	$ 78	$ 818,546	$ (44,402)	1,450,684	$ (2,357,306)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	193,582				193,582
Other comprehensive income (loss)	(5,281)			(5,281)
Issuances under stock plans	10,339		(2,080)			12,419
Common share repurchases	(51,762)					(51,762)
Stock-based compensation expense	46,661		46,661
Ending Balance at Dec. 31, 2016	60,878	78	863,127	(49,683)	1,644,005	(2,396,649)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,279				3,279
Other comprehensive income (loss)	51,191			51,191
Issuances under stock plans and for acquisition	830,446	4	819,313			11,129
Common share repurchases	(41,272)					(41,272)
Stock-based compensation expense	78,943		78,943
Ending Balance at Dec. 31, 2017	983,465	82	1,761,383	1,508	1,647,284	(2,426,792)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2018-02				591	(591)
Adoption of ASU | ASU 2016-16	(13,717)				(13,717)
Net income	122,456				122,456
Other comprehensive income (loss)	(41,966)			(41,966)
Issuances under stock plans	10,181		(3,845)			14,026
Common share repurchases	(275,834)					(275,834)
Stock-based compensation expense	66,172		66,172
Ending Balance at Dec. 31, 2018	$ 850,757	$ 82	$ 1,823,710	$ (39,867)	$ 1,755,432	$ (2,688,600)