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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Total assets | $ 261,813 | $ 1,320
Liabilities: |  |
Total liabilities |  | 19,815
Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities |  | 19,815
Money market funds |  |
Assets: |  |
Total assets | 152 | 146
Commodity derivative instruments |  |
Assets: |  |
Total assets | 261,661 | 1,174
Level 1 |  |
Assets: |  |
Total assets | 152 | 146
Liabilities: |  |
Total liabilities |  | 0
Level 1 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities |  | 0
Level 1 | Money market funds |  |
Assets: |  |
Total assets | 152 | 146
Level 1 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 0 | 0
Level 2 |  |
Assets: |  |
Total assets | 261,661 | 1,174
Liabilities: |  |
Total liabilities |  | 19,815
Level 2 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities |  | 19,815
Level 2 | Money market funds |  |
Assets: |  |
Total assets | 0 | 0
Level 2 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 261,661 | 1,174
Level 3 |  |
Assets: |  |
Total assets | 0 | 0
Liabilities: |  |
Total liabilities |  | 0
Level 3 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities |  | 0
Level 3 | Money market funds |  |
Assets: |  |
Total assets | 0 | 0
Level 3 | Commodity derivative instruments |  |
Assets: |  |
Total assets | $ 0 | $ 0

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