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Derivative Instruments - Summary of Derivative Instruments (Details) - Crude Oil | Sep. 30, 2019 ThousandBarrels / d $ / Barrel
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2019 Settlement |
Derivative [Line Items] |
Derivative instruments (mmbls/day) | ThousandBarrels / d | 8,000.0
2019 Settlement | Short position |
Derivative [Line Items] |
Ceiling sold price (dollars per barrel) | 72.98
Purchase price (dollars per barrel) | 46.72
2019 Settlement | Long position |
Derivative [Line Items] |
Purchase price (dollars per barrel) | 56.72
2020 Settlement |
Derivative [Line Items] |
Derivative instruments (mmbls/day) | ThousandBarrels / d | 109,800
2020 Settlement | Short position |
Derivative [Line Items] |
Ceiling sold price (dollars per barrel) | 74.09
Purchase price (dollars per barrel) | 45.00
2020 Settlement | Long position |
Derivative [Line Items] |
Purchase price (dollars per barrel) | 55.00
2021 Settlement |
Derivative [Line Items] |
Derivative instruments (mmbls/day) | ThousandBarrels / d | 109,500
2021 Settlement | Short position |
Derivative [Line Items] |
Ceiling sold price (dollars per barrel) | 74.09

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