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Convertible Unsecured Subordinated Debentures - Schedule of Debt (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | Dec. 31, 2017 $ / shares | Mar. 14, 2017 | Mar. 01, 2016 CAD
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  |  |  | 2.33% |
Convertible Subordinated Debt | Convertible Unsecured Subordinated Debentures |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | 5.00% |  |  |  | 5.00%
Conversion price (CAD per share) | $ / shares |  |  | $ 10.60 |  |
Convertible Unsecured Subordinated Debentures [Roll Forward] |  |  |  |  |
Carrying value at December 31, 2016 | CAD 358,619,000 |  |  |  |
Receipt of Final instalment, net of deferred financing costs | 743,881,000 | CAD 357,694,000 |  |  |
Amortization of deferred financing costs | 1,134,000 | 925,000 |  |  |
Conversion to common shares | (1,102,416,000) |  |  |  |
Carrying value at December 31, 2017 | 1,218,000 | CAD 358,619,000 |  |  |
Par value | CAD 1,277,000 |  |  |  | CAD 1,150,000,000

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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