Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Basic earnings (loss) per share:
Loss from continuing operations		$ (6,979)	$ (1,181)	$ (9,592)	$ (7,822)
Less: Allocation of earnings to participating securities		0	0	0	0
Loss from continuing operations available to common shareholders - basic		$ (6,979)	$ (1,181)	$ (9,592)	$ (7,822)
Basic weighted-average shares outstanding (1)	[1]	15,331	15,885	15,344	15,847
Basic earnings (loss) per share - continuing operations		$ (0.46)	$ (0.07)	$ (0.63)	$ (0.49)
Diluted earnings (loss) per share:
Loss from continuing operations available to common shareholders - basic		$ (6,979)	$ (1,181)	$ (9,592)	$ (7,822)
Add: Undistributed earnings reallocated to unvested shareholders		0	0	0	0
Loss from continuing operations available to common shareholders - basic		$ (6,979)	$ (1,181)	$ (9,592)	$ (7,822)
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0	0
Directors' stock performance units (2)	[2]	0	0	0	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,331	15,885	15,344	15,847
Diluted earnings (loss) per share - continuing operations		$ (0.46)	$ (0.07)	$ (0.63)	$ (0.49)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		480	476	480	476
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		296	383	296	383

[1] Includes Common and Class B Common shares, excluding unvested participating securities of 480 thousand as of June 27, 2020 and 476 thousand as of June 29, 2019.

[2] Shares issuable under stock option plans where the exercise price is greater than the average market price of the Company's Common Stock during the relevant period and directors' stock performance units have been excluded to the extent they are anti-dilutive. Aggregate shares excluded for the three and six months ended June 27, 2020 were 296 thousand and for the three and six months ended June 29, 2019 were 383 thousand.