Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Derivative contracts
Assets	$ 2,664	$ 484	$ 86
Liabilities	(914)	(2,839)	(3,602)
Derivatives designated as hedging instruments: | Foreign currency forward contracts
Derivative contracts
Notional Amounts	9,010	15,668	19,283
Liabilities	(911)	(2,626)	(2,494)
Derivatives designated as hedging instruments: | Commodity futures contracts
Derivative contracts
Notional Amounts	11,631	13,202	12,799
Assets	2,664	484	86
Liabilities	$ (3)	$ (213)	$ (1,108)