Revenue Recognition - Disaggregation by Geography and Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 223,615	$ 251,073	$ 169,097	$ 167,235	$ 169,769	$ 183,325	$ 199,047	$ 173,484	$ 811,020	$ 725,625	$ 806,338
Standard products and services
Disaggregation of Revenue [Line Items]
Revenue									674,830	629,220	654,509
Application-specific customer solutions
Disaggregation of Revenue [Line Items]
Revenue									136,190	96,405	151,829
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue									310,027	277,155	265,175
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue									208,787	227,738	311,914
Greater China [Member]
Disaggregation of Revenue [Line Items]
Revenue									168,287	115,061	123,708
Other Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 123,919	$ 105,671	$ 105,541