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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 13,628	$ 7,748	$ 22,936	$ (707)
Weighted-average shares outstanding — basic (in shares)	39,432	37,698	39,015	37,266
Effect of dilutive securities from stock award plans (in shares)	1,428	1,275	1,222	0
Weighted-average shares outstanding — diluted (in shares)	40,860	38,973	40,237	37,266
Net income (loss) per share - basic (in dollars per share)	$ 0.35	$ 0.21	$ 0.59	$ (0.02)
Net income (loss) per share - diluted (in dollars per share)	$ 0.33	$ 0.20	$ 0.57	$ (0.02)
Anti-dilutive weighted-average shares related to stock award plans (in shares)	673	1,383	1,176	3,757

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