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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Natural Gas | Jun. 30, 2018 MMBTU / d $ / shares $ / MMBTU
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July-December 2018 Commodity Contract | Swaps | Counterparty Can Elect to Extend Contract |  |
Derivative [Line Items] |  |
Volume Hedged | 160,000 |
Weighted average price of hedge | $ / shares | 3.07 |
2019 Commodity Contract | Swaps |  |
Derivative [Line Items] |  |
Volume Hedged | 514,589 |
Weighted average price of hedge | $ / MMBTU | 2.81 |
2019 Commodity Contract | Swaps | Counterparty Can Elect to Extend Contract |  |
Derivative [Line Items] |  |
Volume Hedged | 130,000 |
Weighted average price of hedge | $ / shares | 2.81 |
2019 Commodity Contract | Swaps | Counterparty Can Elect To Double Volume |  |
Derivative [Line Items] |  |
Volume Hedged | 220,000 |
Weighted average price of hedge | $ / shares | 2.89 |
2020 Commodity Contract | Swaps | Counterparty Can Elect To Double Volume |  |
Derivative [Line Items] |  |
Volume Hedged | 10,000 |
Weighted average price of hedge | $ / shares | 2.75 |
October-December 2018 Commodity Contract | Calls |  |
Derivative [Line Items] |  |
Volume Hedged | 70,000 |
Weighted average price of hedge | $ / MMBTU | 3.10 | [1]
Weighted average deferred premium | $ / MMBTU | 0.16 |
[1] | Weighted average deferred premium of $0.16.

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