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Commitments (Narrative) (Details) - Natural Gas [Member] | Mar. 31, 2017 MMcf / D MMcf / d CAD / Mcf
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April to December 2017 [Member] |
Commitments and Contingencies Disclosure [Line Items] |
Notional amount, per day | MMcf / d | 124
Swap price (per share) | 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) | 2.81

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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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