Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows relating to operating leases	$ 6,257	$ 6,179
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$ 7,503	$ 677