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FAIR VALUE MEASUREMENTS - Other Income From Available For Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 25, 2020
Available-for-sale securities    
Unrealized Gain (Loss) on Securities $ (46) $ (356)
Total 31 (93)
Available-for-sale Securities    
Available-for-sale securities    
Dividend income 74 184
Realized gain (loss) on sale of investments 0 79
Unrealized Gain (Loss) on Securities (46) (356)
Total $ 28 $ (93)