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Consolidated Statement of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Statement of Stockholders' Equity [Abstract]        
Tax effect of unrealized gain (loss) on available-for-sale investments $ 2,855 $ (5) $ 1,067 $ 502