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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative Assets | $ 6,299 | $ 2,991
Derivative Liabilities | 800 | 40,259
Other current assets | Derivatives Not Designated as Hedges | Commodity contracts |  |
Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative Assets | 2,536 | 0
Derivative Liabilities | 0 | 0
Other assets (non-current) | Derivatives Not Designated as Hedges | Commodity contracts |  |
Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative Assets | 3,763 | 2,991
Derivative Liabilities | 0 | 0
Derivative instruments (current) | Derivatives Not Designated as Hedges | Commodity contracts |  |
Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative Assets | 0 | 0
Derivative Liabilities | $ 800 | $ 40,259

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