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. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Numerator:
Net income as reported	$ 55,356	$ (8,991)	$ 24,644	$ 35,647	$ 43,792	$ 36,989	$ 71,009	$ 116,428
Weighted average shares outstanding
Basic (in shares)	24,357			24,482			24,354	24,646
Effect of dilutive securities (in shares)	216			202			181	248
Diluted (in shares)	24,573			24,684			24,535	24,894
Earnings Per Share:
Basic (loss) earnings per share (in dollars per share)	$ 2.27			$ 1.46			$ 2.92	$ 4.72
Diluted (loss) earnings per share (in dollars per share)	$ 2.25			$ 1.44			$ 2.89	$ 4.68