Summary of Significant Accounting Policies (Changes in Future Closed Store Lease Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Restructuring Cost and Reserve [Line Items]
Closed store lease liabilities, Beginning Balance	$ 212
Closed store lease liabilities, Ending Balance	$ 105	$ 212
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Remaining lease term of closed stores	2 years
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Closed store lease liabilities, Beginning Balance	$ 212	955
Additions	0	0
Payments	(33)	(578)
Adjustments	(74)	(165)
Closed store lease liabilities, Ending Balance	$ 105	$ 212