Leases (Lease Cost) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost		$ 2,880	$ 2,969
Short-term Lease, Cost	[1]	114	379
Total lease cost	[2]	$ 2,994	$ 3,348

[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.