Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 29, 2019	Jun. 30, 2018
Numerator:
Net income as reported	$ 43,792	$ 36,989	$ 42,326	$ 36,029	$ 80,781	$ 78,354
Weighted average shares outstanding
Basic (in shares)	24,740		25,004		24,729	24,671
Effect of dilutive securities (in shares)	243		397		269	415
Diluted (in shares)	24,983		25,401		24,998	25,086
Earnings Per Share:
Basic earnings per share (in dollars per share)	$ 1.77		$ 1.69		$ 3.27	$ 3.18
Diluted earnings per share (in dollars per share)	$ 1.75		$ 1.67		$ 3.23	$ 3.12