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Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted shares calculation, amount	$ 100	$ 100	$ 100	$ 100
Net income (loss)	$ (8,558)	$ 3,238	$ (21,985)	$ 3,822
Basic weighted shares outstanding (in shares)	9,215	9,055	9,176	9,011
Dilutive effect of share-based awards (in shares)	0	135	0	130
Diluted weighted average shares outstanding (in shares)	9,215	9,190	9,176	9,141
Basic earnings (loss) per share (in dollars per share)	$ (0.93)	$ 0.36	$ (2.40)	$ 0.42
Diluted earnings (loss) per share (in dollars per share)	$ (0.93)	$ 0.35	$ (2.40)	$ 0.42

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Antidilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding, Amount

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