Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 30, 2015	Dec. 31, 2014
Deferred tax assets:
Self-insurance accruals	$ 8,371	$ 9,063
Capitalized leases	2,083	2,103
Accrued exit cost	935	1,031
Fixed assets	1,638	5,426
Interest rate swaps, deferred tax asset	647	0
Pension, other retirement and compensation plans	11,570	16,527
Other accruals	395	2,526
Alternative minimum tax credit carryforwards	5,344	7,811
General business credit carryforwards - state and federal	20,691	22,089
Net operating loss carryforwards - state	12,172	12,368
Total deferred tax assets before valuation allowance	63,846	78,944
Less: valuation allowance	(12,395)	(12,481)
Total deferred tax assets	51,451	66,463
Deferred tax liabilities:
Intangible assets	(22,190)	(22,474)
Deferred finance costs	(102)	(177)
Interest rate swaps, deferred tax liability	0	(250)
Total deferred tax liabilities	(22,292)	(22,901)
Net deferred tax asset	29,159	43,562
Net deferred tax assets are classified as follows:
Current	0	24,310
Noncurrent	29,159	19,252
Net deferred tax asset	$ 29,159	$ 43,562