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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - 2017 Commodity Contract - Natural Gas | Jun. 30, 2017 $ / MMBTU
--- | ---
Puts | Purchased |
Derivative [Line Items] |
Weighted average deferred premium - purchases | (0.32)
Calls | Sold |
Derivative [Line Items] |
Weighted average deferred premium - sales | 0.27

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