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Long term debt - Series 1 Debentures (Details) - CAD |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 14, 2015 | Apr. 08, 2010 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 14, 2014 | Apr. 07, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debentures |  |  | CAD 576,000 | CAD 54,000 | CAD 6,476,000 |  |
Corporate 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%
Redemption price as a percentage of the principal amount | 101.52% |  |  |  |  |  |
Redemption premium upon a change of control |  |  |  |  |  |  | 101.00%
Redeemed debentures |  |  |  | 16,300,000 |  | CAD 37,500,000 |
Accrued and unpaid debenture interest | CAD 1,200,000 |  |  | CAD 100,000 |  |  |
Loss on extinguishment of debentures | CAD 576,000 |  |  |  |  |  |
Redemption amount of Series 1 Debentures |  |  | CAD 1,300,000 |  |  |  |
Corporate debentures | Series 1 Debentures | On or after April 7, 2016 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price as a percentage of the principal amount |  | 100.00% |  |  |  |  |

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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=34725769&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=6451184&loc=d3e28551-108399 + Details
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- Definition Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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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