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Comprehensive Income (Loss) - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Comprehensive Income (Loss)    
Foreign currency translation adjustments $ (7,033) $ (6,901)
Pension liability, net of tax (17,503) (14,671)
Total accumulated other comprehensive loss $ (24,536) $ (21,572)