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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net Income (Loss) $ 3,995 $ (7,670) $ 4,765 $ (18,484)
Other Comprehensive Income (Loss), net of tax        
Net unrealized gains (losses) on available-for-sale securities 107 104 292 (3,308)
Defined benefit plan adjustments 150 5 271 67
Foreign currency translation 533 (3,424) (627) (2,582)
Other Comprehensive Income (Loss), net of tax 790 (3,315) (64) (5,823)
Comprehensive Income (Loss), net of tax $ 4,785 $ (10,985) $ 4,701 $ (24,307)