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Financial Instruments and Fair Value Measurements (Equity Method Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Equity method investment	$ 20,135		$ 21,470
Non-marketable equity securities	5,723		5,723
Total equity investments	25,858		$ 27,193
Equity method investment (gain) loss	$ 1,335	$ (1,925)

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Non-marketable Equity Securities

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Fair value portion of investments accounted under the equity method.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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