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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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Amount of realized and unrealized gain (loss) on investment.

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