UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)
Balance, beginning of period (in shares) at Dec. 31, 2018		78,526,000
Balance, beginning 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)		(144,000)
Repurchase of common stock	(7,587)	$ (1)	(7,586)
Issuance of common stock for share-based compensation plans (in shares)		514,000
Issuance of common stock for share-based compensation plans	(14,838)	$ 5	(14,843)
Stock-based compensation	$ 18,406		18,406
Cash dividend declared (in dollars per share)	$ 0.03
Cash dividends declared ($0.03 per share)	$ (2,367)			(2,367)
Other comprehensive income	2,001				2,001
Net (loss)	(28,717)			(28,717)
Balance, end of period (in shares) at Mar. 31, 2019		78,896,000
Balance, end of period at Mar. 31, 2019	588,429	$ 789	119,182	479,779	(11,321)
Balance, beginning of period (in shares) at Dec. 31, 2019		79,599,000
Balance, beginning of period at Dec. 31, 2019	539,010	$ 796	140,523	410,919	(13,228)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity component of convertible senior notes, net	61,604		61,604
Repurchase of common stock (in shares)		(87,000)
Repurchase of common stock	(6,000)	$ (1)	(5,999)
Issuance of common stock for share-based compensation plans (in shares)		564,000
Issuance of common stock for share-based compensation plans	(23,011)	$ 6	(23,017)
Stock-based compensation	$ 23,199		23,199
Cash dividend declared (in dollars per share)	$ 0.03
Cash dividends declared ($0.03 per share)	$ (2,405)			(2,405)
Other comprehensive income	(414)				(414)
Net (loss)	$ (25,372)			(25,372)
Balance, end of period (in shares) at Mar. 31, 2020	80,076,000	80,076,000
Balance, end of period at Mar. 31, 2020	$ 566,611	$ 801	$ 196,310	$ 383,142	$ (13,642)