Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
James Horwich [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 114	$ 114
Robert E Shaw [Member]
Related Party Transaction [Line Items]
Ownership of Common Stock, Percentage	8.40%
Voting Interest of Common Stock, Percentage	3.90%
Related Party Transaction, Purchases from Related Party	$ 1,775	$ 1,861
Related Party Transaction, Purchases from Related Party, Percentage	2.50%	2.60%
Robert P Rothman [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 66	$ 65