Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018
Numerator:
Net income as reported	$ 35,647	$ 43,792	$ 36,989	$ 53,546	$ 42,326	$ 36,029	$ 116,428	$ 131,900
Weighted average shares outstanding
Basic (in shares)	24,482			25,109			24,646	24,817
Effect of dilutive securities (in shares)	202			362			248	395
Diluted (in shares)	24,684			25,471			24,894	25,212
Earnings Per Share:
Basic earnings per share (in dollars per share)	$ 1.46			$ 2.13			$ 4.72	$ 5.31
Diluted earnings per share (in dollars per share)	$ 1.44			$ 2.10			$ 4.68	$ 5.23