Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ (2,922)	$ (547)	$ (7,779)	$ 104
Less: Allocation of earnings to participating securities		0	0	0	(32)
Income (loss) from continuing operations available to common shareholders - basic		$ (2,922)	$ (547)	$ (7,779)	$ 72
Basic weighted-average shares outstanding (1)	[1]	15,786	15,707	15,754	15,696
Basic earnings (loss) per share - continuing operations		$ (0.19)	$ (0.03)	$ (0.49)	$ 0.00
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic		$ (2,922)	$ (547)	$ (7,779)	$ 72
Add: Undistributed earnings reallocated to unvested shareholders		0	0	0	0
Income (loss) from continuing operations available to common shareholders - basic		$ (2,922)	$ (547)	$ (7,779)	$ 72
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0	0
Directors' stock performance units (2)	[2]	0	0	0	118
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,786	15,707	15,754	15,814
Diluted earnings (loss) per share - continuing operations		$ (0.19)	$ (0.03)	$ (0.49)	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		673		673
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		426	448	426	307

[1] Includes Common and Class B Common shares, excluding 673 thousand unvested participating securities

[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 nine months ended September 29, 2018 were 426 thousand and for the three and nine months ended September 30, 2017 were 448 thousand and 307 thousand, respectively.