Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2018	Apr. 04, 2017
Net Income Per Share
Antidilutive securities excluded from calculation of basic earnings per share (in shares)	1,700	600
Net income per share, basic and diluted
Net income	$ 26,029	$ 35,043
Basic weighted average shares outstanding (in shares)	45,552	47,634
Dilutive effect of equity awards (in shares)	1,022	1,576
Diluted weighted average shares outstanding (in shares)	46,574	49,210
Basic net income per share (in dollars per share)	$ 0.57	$ 0.74
Diluted net income per share (in dollars per share)	$ 0.56	$ 0.71
Restricted Shares and Restricted Share Units
Net Income Per Share
Antidilutive securities excluded from calculation of basic earnings per share (in shares)	1,800	1,800