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Shares | 12 Months Ended
--- | ---
Dec. 31, 2020
Equity [Abstract] |
Shares | Shares a) Common shares
|  | Common shares |  | Treasury shares |  | Common shares, net of treasury shares
Issued and outstanding at December 31, 2018 |  | 27,088,816 |  |  | (2,084,611) |  |  | 25,004,205 |
Issued upon exercise of stock options |  | 327,000 |  |  | — |  |  | 327,000 |
Issued upon conversion of convertible debentures |  | 87,096 |  |  | — |  |  | 87,096 |
Purchase of treasury shares |  | — |  |  | (735,857) |  |  | (735,857) |
Settlement of certain equity classified stock-based compensation |  | — |  |  | 1,095,001 |  |  | 1,095,001 |
Issued and outstanding at December 31, 2019 |  | 27,502,912 |  |  | (1,725,467) |  |  | 25,777,445 |
Issued upon exercise of stock options |  | 109,100 |  |  | — |  |  | 109,100 |
Issued upon conversion of convertible debentures |  | 4,622,916 |  |  | — |  |  | 4,622,916 |
Retired through share purchase program |  | (1,223,097) |  |  | — |  |  | (1,223,097) |
Purchase of treasury shares |  | — |  |  | (907,462) |  |  | (907,462) |
Settlement of certain equity classified stock-based compensation |  | — |  |  | 787,728 |  |  | 787,728 |
Issued and outstanding at December 31, 2020 |  | 31,011,831 |  |  | (1,845,201) |  |  | 29,166,630 |
Upon settlement of certain equity classified stock-based compensation during the year ended December 31, 2020, the Company repurchased 372,628 shares for $3,576 to satisfy the recipient tax withholding requirements (year ended December 31, 2019 - 513,540 shares for $7,246). The repurchased shares are included in the purchase of treasury shares for settlement of certain equity classified stock-based compensation. b) Net income per share
Year ended December 31, | 2020 |  | 2019
Net income available to common shareholders | $ | 49,208 |  |  | $ | 36,878 |
Interest from convertible debentures (after tax) | 2,370 |  |  | 3,590 |
Diluted net income available to common shareholders | $ | 51,578 |  |  | $ | 40,468 |
Weighted-average number of common shares | 28,165,130 |  |  | 25,444,374 |
Weighted-average effect of dilutive securities |  |  |
Dilutive effect of treasury shares | 1,949,717 |  |  | 1,898,645 |
Dilutive effect of stock options | 90,741 |  |  | 255,378 |
Dilutive effect of 5.00% convertible debentures | 2,095,236 |  |  | 1,647,487 |
Dilutive effect of 5.50% convertible debentures | — |  |  | 3,597,327 |
Weighted-average number of diluted common shares | 32,300,824 |  |  | 32,843,211 |
Basic net income per share | $ | 1.75 |  |  | $ | 1.45 |
Diluted net income per share | $ | 1.60 |  |  | $ | 1.23 |
For the year ended December 31, 2020, all securities were dilutive (year ended December 31, 2019, all securities were dilutive). Commencing on March 12, 2020, the Company engaged in a normal course issuer bid ("NCIB") under which a maximum number of 2,300,000 common shares were authorized to be purchased. During the year ended December 31, 2020, the Company purchased and subsequently cancelled 1,223,097 shares under this NCIB, which resulted in a decrease of common shares of $9,863 and an increase to additional paid-in capital of $755. Subsequent to the year ended December 31, 2020, the Company purchased and subsequently cancelled 377,500 shares under this NCIB, which resulted in a decrease of common shares of $3,068 and an increase to additional paid-in capital of $1,838. c) Dividends
|  | Date declared |  | Per share |  | Shareholders on record as of |  | Paid or payable to shareholders |  | Total paid or payable
Q4 2019 |  | October 29, 2019 |  | $ | 0.04 |  |  | November 30, 2019 |  | January 3, 2020 |  | $ | 1,030 |
Q1 2020 |  | February 18, 2020 |  | $ | 0.04 |  |  | March 5, 2020 |  | April 3, 2020 |  | $ | 1,023 |
Q2 2020 |  | May 5, 2020 |  | $ | 0.04 |  |  | May 29, 2020 |  | July 3, 2020 |  | $ | 1,162 |
Q3 2020 |  | July 28, 2020 |  | $ | 0.04 |  |  | August 31, 2020 |  | October 2, 2020 |  | $ | 1,156 |
Q4 2020 |  | October 27, 2020 |  | $ | 0.04 |  |  | November 30, 2020 |  | January 8, 2021 |  | $ | 1,167 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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