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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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- Definition Long-term Debt, Gross, Non-current + References No definition available. + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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