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Comprehensive Income (Loss) - Comprehensive income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Comprehensive Income (Loss)        
Net earnings $ 1,514 $ 1,523 $ 5,482 $ 4,339
Foreign currency translation adjustments 100 (991) 230 (1,110)
Pension liability, net of tax of $44, $42, $82, and $83, respectively 123 118 231 236
Total comprehensive income $ 1,737 $ 650 $ 5,943 $ 3,465