Income Taxes Schedule of provision of income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Current income tax expense (benefit):
Federal	$ 3,342	$ (491)	$ 9,538
State	1,403	153	2,773
Total current income tax expense (benefit)	4,745	(338)	12,311
Deferred income tax expense (benefit):
Federal	(1,059)	2,441	(725)
Foreign	215	49	19
State	141	501	(103)
Total deferred income tax expense (benefit)	(703)	2,991	(809)
Total income tax expense	$ 4,042	$ 2,653	$ 11,502