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Derivative Instruments - Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Cost of sales        
Derivative Instruments, Gain (Loss)        
Amount of (Gain)/Loss Recognized     $ 3,848 $ 0
Cost of sales, Other expense/(income)        
Derivative Instruments, Gain (Loss)        
Amount of (Gain)/Loss Recognized     $ 821 (296)
Foreign Currency Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Cost Of Good Sold Other Expense Income [Member]        
Derivative Instruments, Gain (Loss)        
Amount of (Gain)/Loss Recognized $ (144)     $ (558)
Commodity Forward Derivatives [Member] | Designated as Hedging Instrument [Member] | Cost of sales        
Derivative Instruments, Gain (Loss)        
Amount of (Gain)/Loss Recognized $ (2,000) $ 0