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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of comprehensive income [abstract]    
Net earnings for the year $ 97,361 $ 73,685
Other comprehensive income (loss):    
Change in fair value of investments in equity securities, net of tax 1,546 1,256
Actuarial losses on employee benefit plans (3,440) (6,361)
Income tax recovery on actuarial losses on employee benefit plans 563 633
Other comprehensive income that will not be reclassified to profit or loss, before tax (1,331) (4,472)
Total comprehensive income for the year 96,030 69,213
Attributable to:    
Shareholders of the Company 103,210 76,114
Non-controlling interests (7,180) (6,901)
Total comprehensive income for the year $ 96,030 $ 69,213