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Derivatives - Amount of Gain (Loss) Recognized in OCI and Income Statement (Details) - Derivatives designated as cash flow hedges - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Interest rate swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) recognized in OCI $ 1 $ (256) $ (611) $ (1,503)
Interest rate swap | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) reclassified from AOCI 96 (153) (8) (519)
Foreign currency forward contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) recognized in OCI   0   0
Foreign currency forward contracts | Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) recognized in OCI 100   841  
Amount of Gain/(Loss) reclassified from AOCI (101) 0 (141) 0
Foreign currency forward contracts | Cost of goods sold        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) reclassified from AOCI $ 250 $ 0 $ 213 $ 0