Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 98,091	$ 98,623
Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	69,011	71,921
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,210	12,142
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16,870	14,560
Product revenue - Distributors
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	77,472	85,957
Product revenue - Direct
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,140	9,152
Licensing and services revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 6,479	$ 3,514