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Derivatives - Amount of Gain (Loss) Recognized in OCI and Income Statement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent $ 64    
Amount of Gain/(Loss) recognized in OCI   $ 901 $ 4,784
Derivatives designated as cash flow hedges | Interest rate swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent 1,559    
Amount of Gain/(Loss) recognized in OCI   853 4,989
Derivatives designated as cash flow hedges | Interest rate swap | Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss) reclassified from AOCI 1,537    
Amount of Gain/(Loss) reclassified from AOCI   95 (718)
Derivatives designated as cash flow hedges | Foreign currency forward contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent 539    
Amount of Gain/(Loss) recognized in OCI   491 (205)
Derivatives designated as cash flow hedges | Foreign currency forward contracts | Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss) reclassified from AOCI 136    
Amount of Gain/(Loss) reclassified from AOCI   (277) 21
Derivatives designated as cash flow hedges | Foreign currency forward contracts | Cost of goods sold      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss) reclassified from AOCI $ 361    
Amount of Gain/(Loss) reclassified from AOCI   $ 625 $ (26)