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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 25, 2016
Mar. 27, 2015
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ (14,013)  
Current-period other comprehensive income 2,477 $ (1,245)
Balance at end of period (11,536)  
Foreign currency translation adjustment    
Accumulated Other Comprehensive Loss [Line Items]    
Foreign currency translation adjustment, net of tax 2,401 (1,412)
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (13,514)  
Balance at end of period (11,113)  
Unrealized gain (loss) on marketable securities    
Accumulated Other Comprehensive Loss [Line Items]    
Unrealized gain (loss) on investments, net of tax 76 $ 167
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (499)  
Balance at end of period $ (423)