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Shares (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of common shares | Issued and outstanding:
|  | Common shares |  |  | Treasury shares |  |  | Common shares, net of treasury shares |
Issued and outstanding at December 31, 2017 |  | 28,070,150 |  |  | (2,617,926 | ) |  | 25,452,224 |
Issued upon exercise of stock options |  | 297,940 |  |  | — |  |  | 297,940 |
Issued upon conversion of convertible debentures |  | 2,211 |  |  | — |  |  | 2,211 |
Purchase of treasury shares |  | — |  |  | (660,620 | ) |  | (660,620 | )
Settlement of certain equity classified stock-based compensation |  | — |  |  | 1,193,935 |  |  | 1,193,935 |
Retired through share purchase program |  | (1,281,485 | ) |  | — |  |  | (1,281,485 | )
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 |
Schedule of net income per share |
Year ended December 31, | 2019 |  |  | 2018 |
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 | 25,444,374 |  |  | 24,991,517 |
Weighted-average effect of dilutive securities |  |  |
Dilutive effect of treasury shares | 1,898,645 |  |  | 2,394,824 |
Dilutive effect of stock options | 255,378 |  |  | 357,026 |
Dilutive effect of 5.00% convertible debentures | 1,647,487 |  |  | — |
Dilutive effect of 5.50% convertible debentures | 3,597,327 |  |  | 3,684,424 |
Weighted-average number of diluted common shares | 32,843,211 |  |  | 31,427,791 |
Basic net income per share | $ | 1.45 |  |  | $ | 0.61 |
Diluted net income per share | $ | 1.23 |  |  | $ | 0.54 |
Schedule of dividends | The Company will pay an annual aggregate dividend of $0.12 per common share in 2019 and intends to pay $0.16 in subsequent years, payable on a quarterly basis.
|  | Date declared |  | Per share |  |  | Shareholders on record as of |  | Paid or payable to shareholders |  | Total paid or payable |
Q4 2018 |  | October 29, 2018 |  | $ | 0.02 |  |  | November 30, 2018 |  | January 4, 2019 |  | $ | 500 |
Q1 2019 |  | February 25, 2019 |  | $ | 0.02 |  |  | March 12, 2019 |  | April 5, 2019 |  | $ | 503 |
Q2 2019 |  | April 30, 2019 |  | $ | 0.02 |  |  | May 31, 2019 |  | July 5, 2019 |  | $ | 505 |
Q3 2019 |  | July 30, 2019 |  | $ | 0.04 |  |  | August 31, 2019 |  | October 4, 2019 |  | $ | 1,028 |
Q4 2019 |  | October 29, 2019 |  | $ | 0.04 |  |  | November 30, 2019 |  | January 3, 2020 |  | $ | 1,030 |

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