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Balance Sheet Components (Equity Method Investments Without Determinable Fair Values) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]      
Equity investments without determinable fair values $ 3,100   $ 4,500
Impairment charges on investment $ 1,400 $ 0