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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) | Dec. 31, 2018 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
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2019 Commodity Contract | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 1,318,041 |
Weighted Average Hedge Price | $ / MMBTU | 2.86 |
2019 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 7,000 |
Weighted Average Hedge Price | $ / bbl | 55.26 |
2019 Commodity Contract | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 2,429 |
Weighted Average Hedge Price | $ / gal | 1.44 |
2019 Commodity Contract | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 113,014 |
Weighted Average Hedge Price | $ / MMBTU | 2.81 | [1]
2019 Commodity Contract | Collars | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 1,000 |
2019 Commodity Contract | Collars | Crude Oil | Minimum |  |
Derivative [Line Items] |  |
Weighted Average Hedge Price | $ / gal | 63.00 |
2019 Commodity Contract | Collars | Crude Oil | Maximum |  |
Derivative [Line Items] |  |
Weighted Average Hedge Price | $ / gal | 73.03 |
2020 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 1,562 |
Weighted Average Hedge Price | $ / bbl | 61.05 |
2020 Commodity Contract | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 80,000 |
Weighted Average Hedge Price | $ / MMBTU | 2.77 | [1]
January-June, 2019 Commodity Contract | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 8,500 |
Weighted Average Hedge Price | $ / gal | 0.92 |
January-June, 2019 Commodity Contract | Collars | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 3,983 |
January-June, 2019 Commodity Contract | Collars | NGLs (C3-Propane) | Minimum |  |
Derivative [Line Items] |  |
Weighted Average Hedge Price | $ / gal | 0.92 |
January-June, 2019 Commodity Contract | Collars | NGLs (C3-Propane) | Maximum |  |
Derivative [Line Items] |  |
Weighted Average Hedge Price | $ / gal | 1.02 |
January-March, 2019 Commodity Contract | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 2,250 |
Weighted Average Hedge Price | $ / gal | 1.22 |
[1] | Contains a combined derivative instrument consisting of a fixed price swap and a sold option to extend or double the volume. In 2019, we have swaps in place for 150,000 Mmbtu per day on which the counterparty can elect to extend the contract through December 2020 at a weighted average price of $2.81. In 2020, if the counterparty elects to double the volume, we would have additional swaps covering 80,000 Mmbtu per day at a weighted average price of $2.77.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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