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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Earnings Per Share
Net income	$ 26,405	$ 15,426
Shares used in computing basic earnings per share (in shares)	42,963	42,096
Effect of dilutive securities:
Stock options and other stock-based awards (in shares)	955	934
Shares used in computing diluted earnings per share (in shares)	43,918	43,030
Earnings per share:
Basic (in dollars per share)	$ 0.61	$ 0.37
Diluted (in dollars per share)	$ 0.60	$ 0.36
Shares excluded from computation of diluted earning per share (in shares)	0	300
Shares issued upon conversion of principal amount
Earnings per share:
Shares excluded from computation of diluted earning per share (in shares)	100

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