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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]        
Maturity period     7 months  
Derivatives not designated as hedging instruments        
Derivative [Line Items]        
Total non-designated derivative realized loss (gain), net $ (2,492,000) $ (693,000) $ (4,860,000) $ (421,000)
Derivatives not designated as hedging instruments | Commodity options        
Derivative [Line Items]        
Notional amount 3,240,000   3,240,000  
Total non-designated derivative realized loss (gain), net 37,000 (153,000) 392,000 119,000
Derivatives not designated as hedging instruments | Foreign exchange forwards        
Derivative [Line Items]        
Notional amount 5,709,000   5,709,000  
Total non-designated derivative realized loss (gain), net 114,000 (237,000) 208,000 (237,000)
Derivatives not designated as hedging instruments | Foreign exchange options        
Derivative [Line Items]        
Notional amount 30,000,000   30,000,000  
Total non-designated derivative realized loss (gain), net $ (2,643,000) $ (303,000) (5,460,000) $ (303,000)
Cash Flow Hedges | Derivatives not designated as hedging instruments | Foreign exchange options        
Derivative [Line Items]        
Total non-designated derivative realized loss (gain), net [1]     $ 182,000  
[1] Includes a loss of $182,000 from the first quarter of 2015 for the discontinuation of cash flow hedges for which the forecasted transactions are not expected to occur within the originally forecasted time frame.