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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)

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- Definition Amount of unrealized gain (loss) recognized in the income statement on unsold other securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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