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Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted shares calculation (in shares)	0		100,000	200,000
Net income (loss)	$ (9,896)	$ 5,686	$ (31,881)	$ 9,508
Basic weighted shares outstanding (in shares)	9,274,000	9,079,000	9,209,000	9,033,000
Dilutive effect of share-based awards (in shares)	0	164,000	0	152,000
Diluted weighted average shares outstanding (in shares)	9,274,000	9,243,000	9,209,000	9,185,000
Basic earnings (loss) per share (in dollars per share)	$ (1.07)	$ 0.63	$ (3.46)	$ 1.05
Diluted earnings (loss) per share (in dollars per share)	$ (1.07)	$ 0.62	$ (3.46)	$ 1.04

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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