Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Earnings Per Share
Net income	$ 83,591	$ 47,092	$ 61,494
Shares used in computing basic earnings per share (in shares)	43,159	42,446	41,713
Effect of dilutive securities:
Stock-based awards	885	886	663
Shares used in computing diluted earnings per share (in shares)	44,044	43,332	42,376
Earnings per share:
Basic (in dollars per share)	$ 1.94	$ 1.11	$ 1.47
Diluted (in dollars per share)	$ 1.90	$ 1.09	$ 1.45
Convertible Senior Notes
Earnings per share:
Shares excluded from computation of diluted earning per share	100	0