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Financial Instruments and Fair Value Measurements (Equity Method Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Oct. 01, 2021
Oct. 02, 2020
Dec. 31, 2020
Fair Value Disclosures [Abstract]          
Equity method investment $ 17,627   $ 17,627   $ 21,470
Non-marketable equity securities 5,723   5,723   5,723
Total equity investments 23,350   23,350   $ 27,193
Equity method investment (gain) loss $ (152) $ (2,234) $ 1,867 $ (3,954)