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Derivative Instruments and Hedging Activities (Fair Value of Derivatives) (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 3,765 $ 3,049
Commodity options | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 8 591
Commodity options | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 162
Foreign exchange options | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 3,757 1,851
Foreign exchange options | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 445
Foreign exchange forwards    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 35 $ 0