Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (4,299)	$ 11,311	$ 15,976	$ 3,284	$ 7,012	$ 19,260
Weighted-average shares outstanding — basic (in shares)	42,659		41,371		42,509	41,033
Effect of dilutive securities from stock award plans (in shares)	0		1,574		1,107	1,613
Weighted-average shares outstanding — diluted (in shares)	42,659		42,945		43,616	42,646
Net income (loss) per share - basic (in dollars per share)	$ (0.10)		$ 0.39		$ 0.16	$ 0.47
Net income (loss) per share - diluted (in dollars per share)	$ (0.10)		$ 0.37		$ 0.16	$ 0.45
Anti-dilutive weighted-average shares related to stock award plans (in shares)	4,931		741		1,929	748