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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Foreign currency translation adjustments, tax $ 0      
Unrealized gains (losses) on marketable securities arising during period, net of tax 678 $ (25) $ 1,256 $ (744)
Reclassification adjustment for (gains) losses included in net income, net of tax (6) (68) (26) 11
Amortization of prior service benefit included in net periodic pension and post-retirement benefit, net of tax $ (11) $ (18) $ (21) $ (35)