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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 25, 2015
Sep. 26, 2014
Sep. 25, 2015
Sep. 26, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment, net of tax $ (881) $ (1,087) $ (1,706) $ (997)
Unrealized gain (loss) on investments, net of tax (835) (81) (281) 372
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     871  
Current-period other comprehensive income (1,716) $ (1,168) (1,987) $ (625)
Balance at end of period (1,116)   (1,116)  
Foreign currency translation adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment, net of tax     (1,706)  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     848  
Balance at end of period (858)   (858)  
Unrealized gain (loss) on marketable securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gain (loss) on investments, net of tax     (281)  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     23  
Balance at end of period $ (258)   $ (258)