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Income (Loss) 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
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted shares calculation (in shares)				100				0
Net income (loss)	$ 55,116	$ 6,695	$ (787)	$ (7,043)	$ 6,301	$ (6,719)	$ 61,024	$ (7,461)
Weighted-average shares outstanding - basic (in shares)	9,461			9,366			9,408	9,351
Dilutive effect of share-based awards (in shares)	170			0			11	0
Weighted-average shares outstanding - diluted (in shares)	9,631			9,366			9,419	9,351
Basic income (loss) (in dollars per share)	$ 5.83			$ (0.75)			$ 6.49	$ (0.80)
Diluted income (loss) (in dollars per share)	$ 5.72			$ (0.75)			$ 6.48	$ (0.80)

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