Leases Supplemental Cash Flow Information Related To Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 3,670	$ 2,154	$ 7,461	$ 7,242
Operating cash flows from finance leases	4	5	9	14
Financing cash flows from finance leases	$ 41	$ 76	$ 87	$ 146