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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement of comprehensive income [abstract]    
Net (loss) earnings for the year $ (135,706) $ 117,615
Other comprehensive (loss) income:    
Change in fair value of investments in equity securities, net of tax 1,009 1,546
Actuarial losses on employee benefit plans (115) (3,440)
Income tax recovery on actuarial losses on employee benefit plans 23 563
Total other comprehensive income (loss) for the year 917 (1,331)
Total comprehensive (loss) income for the year (134,789) 116,284
Attributable to:    
Shareholders of the Company (135,103) 123,464
Non-controlling interests 314 (7,180)
Total comprehensive (loss) income for the year $ (134,789) $ 116,284