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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest rate swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) recognized in OCI $ (893) $ (152) $ (507) $ (881)
Interest rate swap | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) reclassified from AOCI 0 (124) (104) (310)
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 353   741  
Amount of Gain/(Loss) reclassified from AOCI (41) 0 (40) 0
Foreign currency forward contracts | Cost of goods sold        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain/(Loss) reclassified from AOCI $ 28 $ 0 $ (37) $ 0