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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss $ (15,717) $ (13,532)
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss (14,316) (12,630)
Derivatives qualifying as hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss (669) (170)
Defined benefit pension plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss $ (732) $ (732)