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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance $ (13,532)  
Other Comprehensive Income (Loss) before Reclassifications (192)  
Amounts reclassified from AOCI 17  
Other Comprehensive Income (Loss), Net of Tax, total (175) $ 1,227
Closing Balance (13,707)  
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance (12,630)  
Other Comprehensive Income (Loss) before Reclassifications 4  
Amounts reclassified from AOCI 0  
Other Comprehensive Income (Loss), Net of Tax, total 4  
Closing Balance (12,626)  
Derivatives qualifying as hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance (170)  
Other Comprehensive Income (Loss) before Reclassifications (196)  
Amounts reclassified from AOCI 17  
Other Comprehensive Income (Loss), Net of Tax, total (179)  
Closing Balance (349)  
Defined benefit pension plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance (732)  
Other Comprehensive Income (Loss) before Reclassifications 0  
Amounts reclassified from AOCI 0  
Other Comprehensive Income (Loss), Net of Tax, total 0  
Closing Balance $ (732)