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Mandatorily redeemable Series C preferred shares (Details) - CAD CAD / shares in Units, CAD in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Class of Stock [Line Items] |  |
Preferred stock redemption price per share (in CAD per share) | CAD 25 |
Disclosure Estimated Dividend And Redemption Payments [Abstract] |  |
2018 | CAD 279,724 |
2019 | 179,107 |
2020 | 391,025 |
2021 | 152,626 |
2022 | 492,343 |
Thereafter to 2031 | 2,331,327 |
Preferred shares series C, noncurrent | CAD 17,396 | CAD 17,552
Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Redeemable preferred stock issued, shares | 100 |
Preferred stock redemption price per share (in CAD per share) | CAD 53,400 |
Disclosure Estimated Dividend And Redemption Payments [Abstract] |  |
Less amounts representing interest | CAD (9,085) |
Total Preferred shares series C | 18,464 |
Less current portion | (1,068) |
Preferred shares series C, noncurrent | CAD 17,396 |
Executives of company | Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Redeemable preferred stock issued, shares | 36 |
Dividends Payable | Series C Preferred Stock |  |
Disclosure Estimated Dividend And Redemption Payments [Abstract] |  |
2018 | CAD 1,068 |
2019 | 1,282 |
2020 | 1,344 |
2021 | 1,364 |
2022 | 1,390 |
Thereafter to 2031 | 15,761 |
Redemption amount | 5,340 |
Estimated dividend and redemption payments | CAD 27,549 |

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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