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Shares (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of 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 |
Schedule of 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 |
Schedule of 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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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