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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 182,922	$ 266,042	$ 178,080	$ 139,039	$ 806,338	$ 766,083	$ 529,515
Standard products and services
Disaggregation of Revenue [Line Items]
Revenue									654,509	603,196	413,425
Application-specific customer solutions
Disaggregation of Revenue [Line Items]
Revenue									151,829	162,887	116,090
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue									267,043	214,338	162,359
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue									307,965	328,826	230,311
Greater China [Member]
Disaggregation of Revenue [Line Items]
Revenue									126,109	108,738	66,179
Other Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 105,221	$ 114,181	$ 70,666