Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Derivative contracts
Assets	$ 648	$ 484	$ 31
Liabilities	(1,429)	(2,839)	(5,068)
Derivatives designated as hedging instruments: | Foreign currency forward contracts
Derivative contracts
Notional Amounts	12,339	15,668	23,443
Liabilities	(1,350)	(2,626)	(3,328)
Derivatives designated as hedging instruments: | Commodity futures contracts
Derivative contracts
Notional Amounts	12,029	13,202	15,966
Assets	648	484	31
Liabilities	$ (79)	$ (213)	$ (1,740)