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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]    
Net earnings (loss) for the year $ 73,685 $ (379,631)
Other comprehensive income (loss):    
Change in fair value of investments in equity securities 1,256 (2,306)
Actuarial losses on employee benefit plans (6,361) (1,197)
Income tax recovery on actuarial losses on employee benefit plans 633 359
Other comprehensive income that will not be reclassified to profit or loss, before tax (4,472) (3,144)
Total comprehensive income (loss) for the year 69,213 (382,775)
Attributable to:    
Shareholders of the Company 76,114 (365,028)
Non-controlling interests (6,901) (17,747)
Total comprehensive loss for the year $ 69,213 $ (382,775)