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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Total assets | $ 24,869 | $ 107,018
Liabilities: |  |
Total liabilities | 4,445 | 104
Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities | 4,445 | 104
Money market funds |  |
Assets: |  |
Total assets | 144 | 143
Commodity derivative instruments |  |
Assets: |  |
Total assets | 24,725 | 106,875
Level 1 |  |
Assets: |  |
Total assets | 144 | 143
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Money market funds |  |
Assets: |  |
Total assets | 144 | 143
Level 1 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 0 | 0
Level 2 |  |
Assets: |  |
Total assets | 24,725 | 106,875
Liabilities: |  |
Total liabilities | 4,445 | 104
Level 2 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities | 4,445 | 104
Level 2 | Money market funds |  |
Assets: |  |
Total assets | 0 | 0
Level 2 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 24,725 | 106,875
Level 3 |  |
Assets: |  |
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Level 3 | Commodity derivative instruments |  |
Liabilities: |  |
Total liabilities | 0 | 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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