Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Derivative contracts
Assets	$ 673	$ 1,932	$ 648
Liabilities	(718)	(305)	(1,429)
Derivatives designated as hedging instruments: | Foreign currency forward contracts
Derivative contracts
Notional Amounts	1,768	2,357	12,339
Liabilities	(71)	(119)	(1,350)
Derivatives designated as hedging instruments: | Commodity futures contracts
Derivative contracts
Notional Amounts	9,880	10,811	12,029
Assets	673	1,932	648
Liabilities	$ (647)	$ (186)	$ (79)