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Derivative Instruments and Hedging Activities - Effect of Derivatives on Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Effect of derivative instruments on the Consolidated Balance Sheet    
Fair Value Asset $ 0 $ 137,603
Fair Value Liability 0 0
Derivatives Not Designated as Hedges | Commodity contracts | Derivative instruments (current assets)    
Effect of derivative instruments on the Consolidated Balance Sheet    
Fair Value Asset 0 137,603
Derivatives Not Designated as Hedges | Commodity contracts | Derivative instruments (current liabilities)    
Effect of derivative instruments on the Consolidated Balance Sheet    
Fair Value Liability $ 0 $ 0