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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Swaps - Natural Gas | Dec. 31, 2017 MMBTU / d $ / shares $ / MMBTU
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April-December 2018 Commodity Contract | Counterparty Can Elect to Double The Volume |
Derivative [Line Items] |
Volume Hedged | 147,500
Weighted average price of hedge | $ / shares | 2.89
April-December 2018 Commodity Contract | Counterparty Can Elect to Extend Contract |
Derivative [Line Items] |
Volume Hedged | 160,000
Weighted average price of hedge | $ / shares | 3.07
2019 Commodity Contract |
Derivative [Line Items] |
Volume Hedged | 12,329
Weighted average price of hedge | $ / MMBTU | 3.01
2019 Commodity Contract | Counterparty Can Elect to Double The Volume |
Derivative [Line Items] |
Volume Hedged | 85,000
Weighted average price of hedge | $ / shares | 2.97

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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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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
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