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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities | $ 3,915 |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | $ 114
Fair Value, Measurements, Recurring |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset |  |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  |
Assets, Fair Value Disclosure [Abstract] |  |
Netting adjustments, assets |  | 0
Assets at fair value |  | 114
Fair Value, Measurements, Recurring | Commodity derivative contracts |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 0 |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 3,915 |
Assets, Fair Value Disclosure [Abstract] |  |
Netting adjustments, assets |  | 0
Assets at fair value |  | 114
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 | Commodity derivative contracts |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities | 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | 114
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Commodity derivative contracts |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities | 3,915 |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | 114
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 | Commodity derivative contracts |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liabilities | $ 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative assets |  | $ 0

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