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Consolidated Statements of Changes in Shareholders' Equity - CAD ($) $ in Thousands | Total | Common shares | Treasury shares | Additional paid-in capital | Deficit | Shareholders' equity attributable to common shareholders | Noncontrolling interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 145,924 | $ 231,020 | $ (12,350) | $ 54,416 | $ (127,162) | $ 145,924 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 15,321 |  |  |  | 15,286 | 15,286 | 35
Comprehensive income available to shareholders | 15,321 |  |  |  | 15,286 | 15,286 | 35
Exercise of stock options | 1,023 | 1,704 |  | (681) |  | 1,023 |
Stock-based compensation | 4,117 |  | 5,720 | (1,603) |  | 4,117 |
Dividends ($0.12 per share in 2019 and $0.08 in 2018) | (1,996) |  |  |  | (1,996) | (1,996) |
Share purchase program | (9,540) | (10,975) |  | 1,435 |  | (9,540) |
Purchase of treasury shares | (5,072) |  | (5,072) |  |  | (5,072) |
Conversion of convertible debentures | 24 | 24 |  |  |  | 24 |
Distributions to (from) affiliates and joint venture partners | 459 |  |  |  |  |  | 459
Ending balance at Dec. 31, 2018 | 150,215 | 221,773 | (11,702) | 53,567 | (113,917) | 149,721 | 494
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 37,133 |  |  |  | 36,878 | 36,878 | 255
Comprehensive income available to shareholders | 37,133 |  |  |  | 36,878 | 36,878 | 255
Exercise of stock options | 1,953 | 3,248 |  | (1,295) |  | 1,953 |
Stock-based compensation | 3,825 |  | 6,178 | (2,353) |  | 3,825 |
Dividends ($0.12 per share in 2019 and $0.08 in 2018) | (3,066) |  |  |  | (3,066) | (3,066) |
Purchase of treasury shares | (10,387) |  | (10,387) |  |  | (10,387) |
Conversion of convertible debentures | 945 | 945 |  |  |  | 945 |
Distributions to (from) affiliates and joint venture partners | (30) |  |  |  | 250 | 250 | (280)
Effect of change in presentation of NL Partnership | (469) |  |  |  |  |  | (469)
Ending balance at Dec. 31, 2019 | $ 180,119 | $ 225,966 | $ (15,911) | $ 49,919 | $ (79,855) | $ 180,119 | $ 0

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