Common Stock and Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ (9,088)	$ 15,619	$ (21,479)
Less: Allocation of earnings to participating securities		0	(468)	0
Income (loss) from continuing operations available to common shareholders - basic		$ (9,088)	$ 15,151	$ (21,479)
Basic weighted-average shares outstanding (1)	[1]	15,316	15,822	15,764
Basic earnings (loss) per share - continuing operations		$ (0.59)	$ 0.96	$ (1.36)
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic		$ (9,088)	$ 15,151	$ (21,479)
Add: Undistributed earnings reallocated to unvested shareholders		0	3	0
Income (loss) from continuing operations available to common shareholders - basic		$ (9,088)	$ 15,154	$ (21,479)
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0
Directors' stock performance units (2)	[2]	0	104	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,316	15,926	15,764
Diluted earnings (loss) per share - continuing operations		$ (0.59)	$ 0.95	$ (1.36)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		360	461	570
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		281	166	422

[1] Includes Common and Class B Common shares, excluding 360, 461, and 570 unvested participating securities, in thousands, for 2020, 2019, and 2018, respectively.

[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 were 281 in 2020, 166 in 2019 and 422 in 2018.