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Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net Income (Loss) $ 770 $ (10,814)
Other Comprehensive Loss, net of tax    
Net unrealized gains (losses) on available-for-sale securities 185 (3,412)
Defined benefit plan adjustments 121 62
Foreign currency translation (1,160) 842
Other Comprehensive Loss, net of tax (854) (2,508)
Comprehensive Loss, net of tax $ (84) $ (13,322)