Revenues - Narrative (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract with customer, deferred revenues	$ 70,201	$ 68,607	$ 69,485	$ 70,070	$ 60,182	$ 63,308	$ 66,223	$ 72,358
Contract with customer, deferred revenues, current	46,100
Contract with customer, deferred revenues, noncurrent	24,100
Deferred sales commission	$ 4,600				$ 3,000