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Other assets - Deferred financing costs (Details) - CAD CAD in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred financing costs [Abstract] |  |  |
Cost | CAD 9,330 | CAD 9,601 |
Accumulated Amortization | 8,400 | 7,396 |
Net Book Value | 930 | 2,205 |
Amortization of deferred financing costs | 1,961 | 1,594 | CAD 4,326
Interest expense |  |  |
Deferred financing costs [Abstract] |  |  |
Amortization of deferred financing costs | 1,961 | 1,594 | 4,326
Revolving Facilities | Credit facilities |  |  |
Deferred financing costs [Abstract] |  |  |
Cost | 686 | 957 |
Accumulated Amortization | 96 | 426 |
Net Book Value | 590 | 531 |
Financing fees incurred in connection with debt modification | 686 | 87 |
Unamortized deferred financing costs expensed upon redemption of notes | 360 |  |
Series 1 Debentures | Corporate debentures |  |  |
Deferred financing costs [Abstract] |  |  |
Cost | 8,644 | 8,644 |
Accumulated Amortization | 8,304 | 6,970 |
Net Book Value | 340 | 1,674 |
Unamortized deferred financing costs expensed upon redemption of notes | CAD 819 | CAD 534 | CAD 2,737

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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: 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=56944662&loc=d3e3602-108585 Reference 2: 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=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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