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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 23, 2016
Oct. 01, 2017
Sep. 23, 2016
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period $ (8,447) $ (11,757) $ (11,433) $ (14,013)
Total other comprehensive income, net of tax 1,567 2,031 4,553 4,287
Balance at end of period (6,880) (9,726) (6,880) (9,726)
Foreign currency translation adjustment        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (9,344) (11,420) (11,684) (13,514)
Foreign currency translation adjustment, net of tax 1,143 1,247 3,483 3,341
Balance at end of period (8,201) (10,173) (8,201) (10,173)
Unrealized gain (loss) on marketable securities        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period 897 (337) 251 (499)
Unrealized gain (loss) on investments, net of tax 424 784 1,070 946
Balance at end of period $ 1,321 $ 447 $ 1,321 $ 447