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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 24, 2016
Jun. 26, 2015
Jun. 24, 2016
Jun. 26, 2015
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     $ (14,013)  
Current-period other comprehensive income $ (221) $ 974 2,256 $ (271)
Balance at end of period (11,757)   (11,757)  
Foreign currency translation adjustment        
Accumulated Other Comprehensive Loss [Line Items]        
Foreign currency translation adjustment, net of tax (307) 587 2,094 (825)
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     (13,514)  
Balance at end of period (11,420)   (11,420)  
Unrealized gain (loss) on marketable securities        
Accumulated Other Comprehensive Loss [Line Items]        
Unrealized gain (loss) on investments, net of tax 86 $ 387 162 $ 554
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     (499)  
Balance at end of period $ (337)   $ (337)