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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