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Long term debt - Series 1 Debentures (Details) - CAD			12 Months Ended
	Sep. 30, 2016	Apr. 27, 2016	Dec. 31, 2016	Dec. 31, 2015	Aug. 26, 2016	Apr. 07, 2010
Debt Instrument [Line Items]
Long-term debt, gross, non-current			CAD 31,326,000	CAD 22,610,000
Loss on extinguishment of debt			CAD 0	576,000
Debentures
Debt Instrument [Line Items]
Redeemed debentures	CAD 10,000,000	CAD 9,927,000			CAD 10,000,000
Long-term debt, gross, non-current	CAD 0			19,927,000
Debentures | Series 1 Debentures
Debt Instrument [Line Items]
Face amount of long term debt						CAD 225,000,000
Stated interest rate on long term debt					9.125%	9.125%
Redeemed debentures				38,800,000
Redemption price as a percentage of the principal amount	100.00%	100.00%
Loss on extinguishment of debt				CAD 600,000

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Long-term Debt, Gross, Non-current

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Face (par) amount of the original debt instrument that was repurchased.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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-Topic 470
-SubTopic 50
-Section 40
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-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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