Leases (Lease Cost) (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 lease cost		$ 2,471	$ 2,982	$ 5,351	$ 5,951
Short-term Lease, Cost	[1]	554	504	668	883
Total lease cost	[2]	$ 3,025	$ 3,486	$ 6,019	$ 6,834

[1] Includes variable lease cost, which was immaterial.

[2] Included in cost of revenue, sales and marketing, research and development and general and administration in the Company’s unaudited condensed statement of operations.