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Other long term obligations Other long term obligations - Additional disclosures (Details) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Lease Incentive, Payable [Roll Forward]
Balance, beginning of year	CAD 252	CAD 359
Amortization of deferred lease inducements	(107)	(107)
Balance, end of year	252	359	CAD 145	CAD 252
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of year	562	512
Accretion expense	55	50
Balance, end of year	CAD 617	562
Estimated undiscounted cash flows required to settle obligation			CAD 1,084	CAD 1,084
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation (percent)	9.42%
Deferred Gain on Sale Leaseback [Roll Forward]
Balance, beginning of year	CAD 371	0
Addition	512	371
Amortization of deferred gain on sale leaseback	(103)	0
Balance, end of year	CAD 780	CAD 371

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- Definition

Asset Retirement Obligation, Estimated Undiscounted Future Cash Flow to Settle

+ References

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- Definition

Asset Retirement Obligation, Risk-free Rate Used to Measure

+ References

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- Definition

Deferred Gain on Sale Leaseback [Roll Forward]

+ References

No definition available.

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- Definition

Lease Incentive, Payable [Roll Forward]

+ References

No definition available.

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- Definition

Sale Leaseback Transaction, Deferred Gain, Additions

+ References

No definition available.

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- Definition

Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40010-112707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40019-112707

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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

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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-Publisher FASB
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-Paragraph 1
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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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- Definition

This item represents an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

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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- Definition

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.

+ References

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-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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