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Shares (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of common shares |
|  | Common shares |  | Treasury shares |  | Common shares, net of treasury shares
Issued and outstanding at December 31, 2020 |  | 31,011,831 |  |  | (1,845,201) |  |  | 29,166,630 |
Issued upon exercise of stock options |  | 125,000 |  |  | — |  |  | 125,000 |
Retired through share purchase program |  | (1,113,903) |  |  | — |  |  | (1,113,903) |
Purchase of treasury shares |  | — |  |  | (21,503) |  |  | (21,503) |
Settlement of certain equity classified stock-based compensation |  | — |  |  | 301,891 |  |  | 301,891 |
Issued and outstanding at December 31, 2021 |  | 30,022,928 |  |  | (1,564,813) |  |  | 28,458,115 |
Retired through share purchase program |  | (2,195,646) |  |  | — |  |  | (2,195,646) |
Purchase of treasury shares |  | — |  |  | (26,012) |  |  | (26,012) |
Settlement of certain equity classified stock-based compensation |  | — |  |  | 184,364 |  |  | 184,364 |
Issued and outstanding at December 31, 2022 |  | 27,827,282 |  |  | (1,406,461) |  |  | 26,420,821 |
Schedule of net income per share |
Year ended December 31, |  | 2022 |  | 2021
Net income |  | $ | 67,372 |  |  | $ | 51,408 |
Interest from convertible debentures (after tax) |  | 5,893 |  |  | 4,410 |
Diluted net income available to common shareholders |  | $ | 73,265 |  |  | $ | 55,818 |
Weighted-average number of common shares |  | 27,406,140 |  |  | 28,325,489 |
Weighted-average effect of dilutive securities |  |  |  |
Dilutive effect of treasury shares |  | 1,485,275 |  |  | 1,707,718 |
Dilutive effect of stock options |  | — |  |  | 47,767 |
Dilutive effect of 5.00% convertible debentures |  | 2,095,236 |  |  | 2,095,236 |
Dilutive effect of 5.50% convertible debentures |  | 3,020,199 |  |  | 1,770,747 |
Weighted-average number of diluted common shares |  | 34,006,850 |  |  | 33,946,957 |
Basic net income per share |  | $ | 2.46 |  |  | $ | 1.81 |
Diluted net income per share |  | $ | 2.15 |  |  | $ | 1.64 |
Schedule of dividends |
|  | Date declared |  | Per share |  | Shareholders on record as of |  | Paid or payable to shareholders |  | Total paid or payable
Q1 2021 |  | February 16, 2021 |  | $ | 0.04 |  |  | March 4, 2021 |  | April 9, 2021 |  | $ | 1,123 |
Q2 2021 |  | April 27, 2021 |  | $ | 0.04 |  |  | May 28, 2021 |  | July 9, 2021 |  | $ | 1,123 |
Q3 2021 |  | July 27, 2021 |  | $ | 0.04 |  |  | August 31, 2021 |  | October 8, 2021 |  | $ | 1,137 |
Q4 2021 |  | October 26, 2021 |  | $ | 0.04 |  |  | November 30, 2021 |  | January 7, 2022 |  | $ | 1,137 |
Q1 2022 |  | February 15, 2022 |  | $ | 0.08 |  |  | March 4, 2022 |  | April 8, 2022 |  | $ | 2,277 |
Q2 2022 |  | April 26, 2022 |  | $ | 0.08 |  |  | May 27, 2022 |  | July 8, 2022 |  | $ | 2,232 |
Q3 2022 |  | July 26, 2022 |  | $ | 0.08 |  |  | August 31, 2022 |  | October 7, 2022 |  | $ | 2,127 |
Q4 2022 |  | October 25, 2022 |  | $ | 0.08 |  |  | November 30, 2022 |  | January 6, 2023 |  | $ | 2,098 |

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