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Consolidated Statement of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Statement of Stockholders' Equity [Abstract]        
Tax effect of unrealized gain (loss) on available-for-sale investments $ 239 $ 8 $ 507 $ (106)