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Shares - Net income per share (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Net income available to common shareholders | $ 36,878 | $ 15,286
Interest from convertible debentures (after tax) | 3,590 | 1,792
Diluted net income available to common shareholders | $ 40,468 | $ 17,078
Weighted average number of common shares (in shares) | 25,444,374 | 24,991,517
Weighted-average effect of dilutive securities |  |
Dilutive effect of treasury shares (in shares) | 1,898,645 | 2,394,824
Dilutive effect of stock options (in shares) | 255,378 | 357,026
Weighted average number of diluted common shares (in shares) | 32,843,211 | 31,427,791
Basic net income per share (in CAD per share) | $ 1.45 | $ 0.61
Diluted net income per share (in CAD per share) | $ 1.23 | $ 0.54
5.00% convertible debentures |  |
Weighted-average effect of dilutive securities |  |
Dilutive effect of convertible debentures (in shares) | 1,647,487 | 0
5.50% convertible debentures |  |
Weighted-average effect of dilutive securities |  |
Dilutive effect of convertible debentures (in shares) | 3,597,327 | 3,684,424
Stock options |  |
Weighted-average effect of dilutive securities |  |
Anti-dilutive awards not considered in computing diluted earnings per share (in shares) | 0 | 14,247

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256 + Details
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