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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
Mar. 31, 2018
Mar. 31, 2017
Interest rate swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain/(Loss) recognized in OCI $ 2,120 $ 385
Interest rate swap | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain/(Loss) reclassified from AOCI 213 (104)
Foreign currency forward contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain/(Loss) recognized in OCI   388
Foreign currency forward contracts | Revenue    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain/(Loss) recognized in OCI 174  
Amount of Gain/(Loss) reclassified from AOCI (151) 1
Foreign currency forward contracts | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain/(Loss) reclassified from AOCI $ 241 $ (65)