Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning	$ 30	$ (530)
Unrealized gain on interest rate swaps, net of tax	0	94
Reclassification of loss into earnings from interest rate swaps, net of tax	(5)	135
Reclassification of unrealized loss into earnings from dedesignated interest rate swaps, net of tax	177	337
Unrecognized net actuarial gain on postretirement benefit plans, net of tax	39	18
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net of tax	(22)	(6)
Balance ending	219	30	$ (530)
Income taxes	33	174
Income taxes	0	0
Income taxes	0	0
Unrealized gain on interest rate swaps, tax	0	0
Reclassification of loss into earnings from interest rate swaps, tax	(2)	0
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning	(172)	(738)
Unrealized gain on interest rate swaps, net of tax	0	94
Reclassification of loss into earnings from interest rate swaps, net of tax	(5)	135
Reclassification of unrealized loss into earnings from dedesignated interest rate swaps, net of tax	177	337
Balance ending	0	(172)	(738)
Post-Retirement Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning	202	208
Unrecognized net actuarial gain on postretirement benefit plans, net of tax	39
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net of tax	(22)	(6)
Balance ending	$ 219	202	208
Income taxes		0	0
Income taxes		0
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Income taxes		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		(2)	0
Income taxes		$ 33	$ 174