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Comprehensive Income (Loss) - Comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Comprehensive Income (Loss)        
Net earnings (loss) $ 5,069 $ (5,869) $ 10,214 $ (13,590)
Foreign currency translation adjustments (601) 751 (568) (217)
Pension liability, net of tax of $64, $49, $193 and $149, respectively 183 142 548 424
Total comprehensive income (loss) $ 4,651 $ (4,976) $ 10,194 $ (13,383)