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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

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