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Derivative Financial Instruments - Gains and Losses on Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Amounts of gains and losses on the derivative instruments    
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ (943) $ 187
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold (226) 2,851
Designated as hedging instruments | Cash flow hedges    
Amounts of gains and losses on the derivative instruments    
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss (943) 187
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ (226) $ 2,851