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FAIR VALUE MEASUREMENTS - Other Income From Available For Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Available-for-sale securities        
Other Income $ 229 $ 151 $ 622 $ 197
Available-for-sale Securities        
Available-for-sale securities        
Dividend income 222 133 591 133
Interest income 19 22 58 68
Loss on investments (12) (4) (27) (4)
Other Income $ 229 $ 151 $ 622 $ 197