Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 26, 2018	Dec. 27, 2017
Deferred tax assets:
Self-insurance accruals	$ 4,647	$ 4,364
Capitalized leases	2,045	1,718
Accrued exit cost	445	487
Interest rate swaps	1,157	566
Pension, other retirement and compensation plans	10,568	10,328
Deferred income	5,099	609
Other accruals	633	0
Alternative minimum tax credit carryforwards	928	3,534
General business and foreign tax credit carryforwards - state and federal	11,061	13,355
Net operating loss carryforwards - state	13,899	14,096
Total deferred tax assets before valuation allowance	50,482	49,057
Less: valuation allowance	(13,199)	(13,078)
Total deferred tax assets	37,283	35,979
Deferred tax liabilities:
Intangible assets	(14,631)	(14,578)
Deferred finance costs	(286)	(111)
Fixed assets	(5,033)	(4,179)
Other accruals	0	(166)
Total deferred tax liabilities	(19,950)	(19,034)
Net deferred tax asset	$ 17,333	$ 16,945