Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 29, 2015	Dec. 30, 2014
Assets:
General business credit carryforwards	$ 18,915	$ 16,236
Insurance reserves	11,843	10,511
Profit sharing and vacation	8,906	8,423
Unfavorable leasehold interests	2,815	3,520
Deferred rent	3,671	3,035
Other	2,193	1,894
Total deferred tax assets	48,343	43,619
Liabilities:
Depreciation and amortization	(231,500)	(233,147)
Debt refinancing	(1,136)	(2,879)
Favorable leasehold interests	(2,915)	(3,331)
Other	(2,555)	(1,946)
Total deferred tax liabilities	(238,106)	(241,303)
Net deferred tax liability	$ (189,763)	$ (197,684)