Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 266	$ 265
Additions	0	5
Reductions	(11)	(4)
Balance at end of period	$ 255	$ 266