Derivative Instruments and Hedging Activities - OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	$ 57	$ (377)	$ 607	$ (1,849)
Reclassified from Accumulated OCI into Earnings
Effect of derivative instruments on earnings
Gain (Loss) Reclassified from Accumulated OCI into Earnings	(162)	(548)	(258)	(835)
Foreign currency forward contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	180		390	(11)
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		67
Commodity futures contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(123)	(377)	217	(1,838)
Commodity futures contracts | Reclassified from Accumulated OCI into Earnings
Effect of derivative instruments on earnings
Gain (Loss) Reclassified from Accumulated OCI into Earnings	$ (162)	$ (568)	$ (258)	$ (902)