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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance $ (10,676) $ (16,658)
Other Comprehensive Income (Loss) before Reclassifications (3,267) 5,621
Amounts reclassified from AOCI 411 361
Other Comprehensive Income (Loss), Net of Tax, total (2,856) 5,982
Closing Balance (13,532) (10,676)
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance (9,755) (14,200)
Other Comprehensive Income (Loss) before Reclassifications (2,875) 4,445
Amounts reclassified from AOCI 0 0
Other Comprehensive Income (Loss), Net of Tax, total (2,875) 4,445
Closing Balance (12,630) (9,755)
Derivatives qualifying as hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance 37 0
Other Comprehensive Income (Loss) before Reclassifications (343) (24)
Amounts reclassified from AOCI 136 61
Other Comprehensive Income (Loss), Net of Tax, total (207) 37
Closing Balance (170) 37
Defined benefit pension plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening Balance (958) (2,458)
Other Comprehensive Income (Loss) before Reclassifications (49) 1,200
Amounts reclassified from AOCI 275 300
Other Comprehensive Income (Loss), Net of Tax, total 226 1,500
Closing Balance $ (732) $ (958)