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Comprehensive Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Comprehensive Income    
Foreign currency translation adjustments $ (7,382) $ (6,901)
Pension liability, net of tax (14,324) (14,671)
Total accumulated other comprehensive loss $ (21,706) $ (21,572)