Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 226	$ 114	$ 567	$ 343
Robert E Shaw [Member]
Related Party Transaction [Line Items]
Ownership of Common Stock, Percentage	8.40%		8.40%
Voting Interest of Common Stock, Percentage	3.90%		3.90%
Related Party Transaction, Purchases from Related Party	$ 1,844	$ 2,396	$ 5,478	$ 6,889
Related Party Transaction, Purchases from Related Party, Percentage	2.50%	2.90%	2.50%	2.90%
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 67	$ 66	$ 200	$ 196