Operating Leases (Details 1) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,841	$ 1,825
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 256	$ 1,433