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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Swaps - Natural Gas	Jun. 30, 2019 MMBTU / d $ / MMBTU
November-December 2019 Commodity Contract | Counterparty Can Elect to Double The Volume
Derivative [Line Items]
Volume Hedged | MMBTU / d	20,000
Weighted average price of hedge | $ / MMBTU	3.20
2019 Commodity Contract
Derivative [Line Items]
Volume Hedged | MMBTU / d	1,262,473
Weighted average price of hedge | $ / MMBTU	2.81
2019 Commodity Contract | Counterparty Can Elect to Extend Contract
Derivative [Line Items]
Volume Hedged | MMBTU / d	150,000
Weighted average price of hedge | $ / MMBTU	2.81
2020 Commodity Contract
Derivative [Line Items]
Volume Hedged | MMBTU / d	305,000
Weighted average price of hedge | $ / MMBTU	2.76
2020 Commodity Contract | Counterparty Can Elect to Double The Volume
Derivative [Line Items]
Volume Hedged | MMBTU / d	140,000
Weighted average price of hedge | $ / MMBTU	2.78
2020 Commodity Contract | Counterparty Can Elect to Extend Contract
Derivative [Line Items]
Volume Hedged | MMBTU / d	50,000
Weighted average price of hedge | $ / MMBTU	2.75
January-March 2020 Commodity Contract | Counterparty Can Elect to Double The Volume
Derivative [Line Items]
Volume Hedged | MMBTU / d	20,000
Weighted average price of hedge | $ / MMBTU	3.20

X

- 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

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- Definition

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+ References

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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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