EXPLORATION AND EVALUATION ASSETS - Summary of Exploration and Evaluation Assets (Details) - Exploration and evaluation assets - CAD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]
Balance at beginning of period	$ 29,246	$ 87,919
Additions	1,664	2,349
Dispositions	(7,843)	(31,176)
Transfer to oil and natural gas properties	(336)	(29,846)
Balance at end of period	$ 22,731	$ 29,246

The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill]

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The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill]

+ References

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The increase (decrease) in intangible assets other than goodwill resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

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