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Comprehensive Income (Loss) - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Comprehensive Income (Loss)    
Foreign currency translation adjustments $ (8,001) $ (7,033)
Pension liability, net of tax (17,221) (17,503)
Total accumulated other comprehensive loss $ (25,222) $ (24,536)