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SUBSEQUENT EVENT (Details) MMcf in Millions, CAD in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 07, 2016 CAD MMcf | Dec. 31, 2015 CAD | Dec. 31, 2014 CAD
Subsequent Events |  |  |
Cash consideration |  | CAD 106 | CAD 394
Subsequent Event | Tupper Main and Tupper West | Forecast |  |  |
Subsequent Events |  |  |
Ownership interest acquired (as a percent) | 100.00% |  |
Cash consideration | CAD 538 |  |
Processing capacity | MMcf | 320 |  |

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