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Financial instruments and risk management - Trade receivables (Details) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Not past due	CAD 23,946	CAD 60,543
Past due 1-30 days	0	3,658
Past due 31-60 days	0	2
More than 61 days	82	1,271
Total	24,028	65,474
Allowance for Doubtful Accounts Receivable [Roll Forward]
Opening balance	0	0
Current year allowance	0	164
Write-offs	0	(164)
Ending balance	CAD 0	CAD 0

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- Definition

Accounts Receivable, 1 to 30 Days Past Due

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Accounts Receivable, 31 to 60 Days Past Due

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Accounts Receivable, Current

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Accounts Receivable, Greater than 60 Days Past Due

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC
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-Paragraph 3
-Subparagraph a(1)
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-Publisher SEC
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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
-SubTopic 10
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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