Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Derivative contracts
Assets	$ 3,256	$ 484	$ 49
Liabilities	(554)	(2,839)	(3,958)
Derivatives designated as hedging instruments: | Foreign currency forward contracts
Derivative contracts
Notional Amounts	5,684	15,668	22,500
Liabilities	(532)	(2,626)	(2,977)
Derivatives designated as hedging instruments: | Commodity futures contracts
Derivative contracts
Notional Amounts	11,047	13,202	10,263
Assets	3,256	484	49
Liabilities	$ (22)	$ (213)	$ (981)