Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Earnings Per Share [Abstract]
Net income	$ 51,320	$ (12,630)	$ 39,140	$ 28,054	$ 4,280	$ 25,418	$ 77,830	$ 57,752
Reconciliation of weighted-average shares outstanding:
Basic weighted-average shares outstanding (in shares)	27,973,000			29,085,000			27,918,000	29,859,000
Dilutive effect of stock-based awards (in shares)	661,000			711,000			642,000	829,000
Diluted weighted-average shares outstanding (in shares)	28,634,000			29,796,000			28,560,000	30,688,000
Net income per share – basic (in dollars per share)	$ 1.83			$ 0.96			$ 2.79	$ 1.93
Net income per share – diluted (in dollars per share)	$ 1.79			$ 0.94			$ 2.73	$ 1.88