Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative [Line Items]
Total non-designated derivative realized loss (gain), net	$ 71	$ (3,740)
Commodity options
Derivative [Line Items]
Total non-designated derivative realized loss (gain), net	0	429
Foreign exchange forwards
Derivative [Line Items]
Total non-designated derivative realized loss (gain), net	71	0
Foreign exchange options
Derivative [Line Items]
Total non-designated derivative realized loss (gain), net	$ 0	$ (4,169)