Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Total finance lease expense	$ 24	$ 0	$ 48	$ 0
Total operating lease expense	619	640	1,276	1,340
Total short-term lease expense	0	136	0	255
Total lease expense	643	776	1,324	1,595
SG&A Expense
Total finance lease expense	19	0	38	0
Total operating lease expense	467	435	905	922
Total short-term lease expense	0	136	0	255
Interest Expense, Net
Total finance lease expense	5	0	10	0
Operating Costs
Total operating lease expense	152	205	371	418
Total short-term lease expense	$ 0	$ 0	$ 0	$ 0