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Derivatives - Schedule of Fair Values (Gross and Net) of Outstanding Derivatives (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ 4,733 | $ 91,885
Commodity Contracts | Current assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts Recognized at Fair Value | 17,799 | 89,981
Gross Amounts Offset on Balance Sheet | (8,633) | (1,385)
Net Fair Value Presented on Balance Sheet | 9,166 | 88,596
Commodity Contracts | Non-current assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts Recognized at Fair Value | 773 | 3,289
Gross Amounts Offset on Balance Sheet | (248) | 0
Net Fair Value Presented on Balance Sheet | 525 | 3,289
Commodity Contracts | Current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts Recognized at Fair Value | (13,450) | (1,385)
Gross Amounts Offset in the Balance Sheet | 8,633 | 1,385
Net Fair Value Presented in the Balance Sheet | (4,817) | $ 0
Commodity Contracts | Non-current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts Recognized at Fair Value | (389) |
Gross Amounts Offset in the Balance Sheet | 248 |
Net Fair Value Presented in the Balance Sheet | $ (141) |

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