Revenue Recognition - Disaggregation by Geography and Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 169,769	$ 183,325	$ 199,047	$ 173,484	$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 725,625	$ 806,338	$ 766,083
Standard products and services
Disaggregation of Revenue [Line Items]
Revenue									629,220	654,509	603,196
Application-specific customer solutions
Disaggregation of Revenue [Line Items]
Revenue									96,405	151,829	162,887
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue									277,155	265,175	214,338
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue									227,738	311,914	328,826
Greater China [Member]
Disaggregation of Revenue [Line Items]
Revenue									115,061	123,708	108,738
Other Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 105,671	$ 105,541	$ 114,181