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Comprehensive (Loss) Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Comprehensive (Loss) Income    
Foreign currency translation adjustments $ (9,591) $ (7,033)
Pension liability, net of tax (17,365) (17,503)
Total accumulated other comprehensive loss $ (26,956) $ (24,536)