CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period (in shares) at Dec. 31, 2016		76,591,000
Balance, beginning of period at Dec. 31, 2016	$ 548,940	$ 766	$ 143,903	$ 420,472	$ (16,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)		(99,000)
Repurchase of common stock	(4,493)		(4,493)
Issuance of common stock for share-based compensation plans (in shares)		1,568,000
Issuance of common stock for share-based compensation plans	(41,627)	$ 15	(41,642)
Issuance of common stock under Employee Stock Purchase Plan (in shares)		21,000
Issuance of common stock under Employee Stock Purchase Plan	1,009		1,009
Stock-based compensation	53,320		53,320
Cash dividends declared	(9,323)			(9,323)
Other comprehensive (loss)	9,496				9,496
Net (loss) income	98,548			98,548
Balance, end of period (in shares) at Dec. 31, 2017		78,081,000
Balance, end of period at Dec. 31, 2017	655,870	$ 781	152,097	509,697	(6,705)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)		(1,001,000)
Repurchase of common stock	(55,275)	$ (10)	(55,265)
Issuance of common stock for share-based compensation plans (in shares)		1,413,000
Issuance of common stock for share-based compensation plans	(39,361)	$ 14	(39,375)
Issuance of common stock under Employee Stock Purchase Plan (in shares)		33,000
Issuance of common stock under Employee Stock Purchase Plan	1,767		1,767
Stock-based compensation	63,981		63,981
Cash dividends declared	(9,451)			(9,451)
Other comprehensive (loss)	(6,617)				(6,617)
Net (loss) income	$ 10,617			10,617
Balance, end of period (in shares) at Dec. 31, 2018	78,526,000	78,526,000
Balance, end of period at Dec. 31, 2018	$ 621,531	$ 785	123,205	510,863	(13,322)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)		(333,000)
Repurchase of common stock	(21,136)	$ (3)	(21,133)
Issuance of common stock for share-based compensation plans (in shares)		1,375,000
Issuance of common stock for share-based compensation plans	(44,839)	$ 14	(44,853)
Issuance of common stock under Employee Stock Purchase Plan (in shares)		31,000
Issuance of common stock under Employee Stock Purchase Plan	2,202		2,202
Stock-based compensation	81,102		81,102
Cash dividends declared	(9,511)			(9,511)
Other comprehensive (loss)	94				94
Net (loss) income	$ (90,433)			(90,433)
Balance, end of period (in shares) at Dec. 31, 2019	79,599,000	79,599,000
Balance, end of period at Dec. 31, 2019	$ 539,010	$ 796	$ 140,523	$ 410,919	$ (13,228)