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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers $ 266,619 $ 272,990
Greater China [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 131,432 144,153
Southeast Asia Pacific [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 56,922 54,515
North Asia [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 27,251 22,228
Asia Pacific [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 215,605 220,896
Americas And Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers $ 51,014 $ 52,094