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Other long term obligations (Details) - CAD CAD in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]
Deferred lease inducements liability (note 16(b))	CAD 38	CAD 145
Asset retirement obligation (note 16(c))	678	617	CAD 562
Deferred gain on sale leaseback (note 16(d))	3,199	780	CAD 371
Other obligations, current and noncurrent	8,860	4,459
Less current portion of:
Deferred gain on sale leaseback	(586)	(221)
Other obligations, noncurrent portion	8,274	3,567
Restricted share units (RSUs) | Restricted share unit plan
Other Liabilities, Noncurrent [Abstract]
Restricted share / Deferred stock unit plan (notes 21(d) and (f))	0	671
Less current portion of:
Deferred compensation plans, current	0	(671)
Deferred stock units (DSUs) | Directors' deferred share unit plan
Other Liabilities, Noncurrent [Abstract]
Restricted share / Deferred stock unit plan (notes 21(d) and (f))	CAD 4,945	CAD 2,246

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- Definition

Lease Incentive Payable, Noncurrent

+ References

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- Definition

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+ References

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Asset Retirement Obligation
-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ 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 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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- Definition

Amount of liabilities classified as other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

+ 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 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754

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