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Shares - Net income per share (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($) $ / shares shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 CAD ($) $ / shares shares | Dec. 31, 2017 $ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Net Income (Loss) Attributable to Parent | $ | $ 15,286 |  | $ 5,264 |
Interest from Convertible Debentures (after tax) | $ | 1,792 |  | 0 |
Diluted net income available to common shareholders | $ | $ 17,078 |  | $ 5,264 |
Weighted average number of common shares (in shares) | 24,991,517 |  | 26,697,066 |
Weighted average effect of dilutive securities |  |  |  |
Dilutive effect of treasury shares (in shares) | 2,394,824 |  | 2,622,957 |
Dilutive effect of stock options (in shares) | 357,026 |  | 285,703 |
Dilutive effect of Convertible Debentures | 3,684,424 |  | 0 |
Weighted average number of diluted common shares (in shares) | 31,427,791 |  | 29,605,726 |
Basic net income per share (in CAD per share) | (per share) | $ 0.61 | $ 0.61 | $ 0.20 | $ 0.20
Diluted net income per share (in CAD per share) | (per share) | $ 0.54 | $ 0.54 | $ 0.18 | $ 0.18
Stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive awards not considered in computing diluted earnings per share (in shares) | 14,247 |  | 469,819 |
Convertible debentures |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive awards not considered in computing diluted earnings per share (in shares) |  |  | 2,949,309 |

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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=114873790&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=109260490&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=109256448&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=115205541&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=109260490&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=114873765&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=109260490&loc=SL5780133-109256 + Details
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