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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 20,605	$ 603	$ 30,760
Weighted-average shares outstanding — basic	37,483	36,156	35,857
Add: Dilutive effect of employee stock plans	1,229	708	861
Weighted-average shares outstanding — diluted	38,712	36,864	36,718
Net income, basic (usd per share)	$ 0.55	$ 0.02	$ 0.86
Net income, diluted (usd per share)	$ 0.53	$ 0.02	$ 0.84
Anti-dilutive weighted-average shares related to stock award plans	501	1,345	555

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