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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 257,063 $ 258,514 $ 512,386 $ 498,963
Greater China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 136,702 131,840 268,440 248,838
Southeast Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 48,665 51,123 99,071 99,984
North Asia [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 13,948 11,261 26,904 21,821
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 199,315 194,224 394,415 370,643
Americas And Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 57,748 $ 64,290 $ 117,971 $ 128,320