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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]    
Net Income (Loss) $ 896 $ (9,969)
Other Comprehensive Loss, net of tax    
Net unrealized gains (losses) on available-for-sale securities (192) 117
Defined benefit plan adjustments 99 141
Foreign currency translation (1,863) (1,650)
Other Comprehensive Loss, net of tax (1,956) (1,392)
Comprehensive Loss, net of tax $ (1,060) $ (11,361)