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Derivative Instruments and Hedging Activities - OCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Effect of derivative instruments on earnings        
Gain (Loss) Recognized in OCI $ (377) $ (1,204) $ (1,849) $ (1,754)
Reclassified from Accumulated OCI into Earnings        
Effect of derivative instruments on earnings        
Gain (Loss) Reclassified from Accumulated OCI into Earnings (548) (985) (835) 137
Foreign currency forward contracts        
Effect of derivative instruments on earnings        
Gain (Loss) Recognized in OCI   125 (11) 148
Foreign currency forward contracts | Reclassified from Accumulated OCI into Earnings        
Effect of derivative instruments on earnings        
Gain (Loss) Reclassified from Accumulated OCI into Earnings 20 (29) 67 (54)
Commodity futures contracts        
Effect of derivative instruments on earnings        
Gain (Loss) Recognized in OCI (377) (1,329) (1,838) (1,902)
Commodity futures contracts | Reclassified from Accumulated OCI into Earnings        
Effect of derivative instruments on earnings        
Gain (Loss) Reclassified from Accumulated OCI into Earnings $ (568) $ (956) $ (902) $ 191