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Commitments (Narrative) (Details) - Natural Gas [Member] | Jun. 30, 2017 MMcf / D MMcf / d $ / Mcf CAD / Mcf
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July to December 2017 [Member] |
Commitments and Contingencies Disclosure [Line Items] |
Notional amount, per day | MMcf / d | 124
Swap price (per share) | CAD / Mcf | 2.97
January 2018 to December 2020 [Member] |
Commitments and Contingencies Disclosure [Line Items] |
Notional amount, per day | MMcf / D | 59
Swap price (per share) | CAD / Mcf | 2.81
November 2017 to March 2018 [Member] |
Commitments and Contingencies Disclosure [Line Items] |
Notional amount, per day | MMcf / d | 20
Swap price (per share) | $ / Mcf | 3.51

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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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