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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. 23, 2020
Sep. 25, 2019
Sep. 23, 2020
Sep. 25, 2019
Available-for-sale securities        
Unrealized Gain (Loss) on Securities     $ (22) $ 231
Total $ 34 $ 248 335 1,259
Available-for-sale Securities        
Available-for-sale securities        
Dividend income 40 254 290 997
Realized gain (loss) on sale of investments 0 0 79 22
Unrealized Gain (Loss) on Securities 0 0 (22) 231
Total $ 40 $ 254 $ 347 $ 1,250