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Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets $ 15,585 $ 19,943
Derivative Liabilities (4,290)  
Current assets - Fair market value of derivatives [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative asset, fair value, gross asset 15,749 19,943
Derivative asset, fair value, gross liability (164)  
Derivative Assets 15,585 $ 19,943
Current liabilities - Fair value of derivatives [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative liability, fair value, gross liability (852)  
Derivative liability, fair value, gross asset 164  
Derivative Liabilities (688)  
Non-Current Liabilities Fair Market Value Of Derivatives [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative liability, fair value, gross liability (3,602)  
Derivative Liabilities $ (3,602)