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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers $ 272,990 $ 291,998
Greater China [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 144,153 157,808
Southeast Asia Pacific [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 54,515 56,228
North Asia [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 22,228 18,084
Asia Pacific [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers 220,896 232,120
Americas And Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Sales to External Customers $ 52,094 $ 59,878