Financial Instruments and Fair Value Measurements Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 03, 2020	Mar. 29, 2019	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Equity method investment	$ 18,092		$ 16,167
Non-marketable equity securities	6,092		6,092
Total equity investments	24,184		$ 22,259
Equity method investment (income) loss	$ (1,925)	$ 41

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

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