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Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]        
Total non-designated derivative realized loss (gain), net $ (2,492) $ (693) $ (4,860) $ (421)
Commodity options        
Derivative [Line Items]        
Total non-designated derivative realized loss (gain), net 37 (153) 392 119
Foreign exchange options        
Derivative [Line Items]        
Total non-designated derivative realized loss (gain), net $ (2,643) $ (303) $ (5,460) $ (303)