Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Leases [Abstract]
Operating leases expense	$ 1,008	$ 963
Finance leases expense:
Amortization of right-of-use assets	60	45
Interest on lease liabilities	10	9
Total finance lease expense	$ 70	$ 54