Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 226	$ 114	$ 341	$ 229
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	$ 1,859	$ 2,632	$ 3,634	$ 4,493
Related Party Transaction, Purchases from Related Party, Percentage	2.40%	3.30%	2.50%	2.90%
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 66	$ 65	$ 132	$ 130