Income Taxes (Provision (Benefit) Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2016	Dec. 29, 2015	Dec. 30, 2014
Current:
Federal	$ 1,959	$ 1,401	$ (3,068)
State	854	752	498
Deferred:
Federal	(4,603)	(7,051)	(6,503)
State	(953)	(870)	627
Income tax benefit	$ (2,743)	$ (5,768)	$ (8,446)