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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 261,765 $ 254,219 $ 774,151 $ 753,182
Greater China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 131,273 124,470 399,713 373,308
Southeast Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 52,310 54,351 151,381 154,335
North Asia [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 15,708 11,555 42,612 33,376
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 199,291 190,376 593,706 561,019
Americas And Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 62,474 $ 63,843 $ 180,445 $ 192,163