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Basis of preparation - Effect of error correction on consolidated statements of operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reclassifications or changes in presentation [line items]    
Depreciation   $ 218,129
Income tax expense   87,401
Net (loss) earnings for the year $ (135,706) 117,615
Continuing operations 10,782 131,147
Shareholders of the Company $ (135,103) $ 123,464
Net earnings per share attributable to shareholders - basic (in dollars per share) $ (0.75) $ 0.73
Net earnings per share attributable to shareholders - diluted (in dollars per share) (0.75) 0.71
Net earnings per share attributable to shareholders, continuing operations - basic (in dollars per share) 0.06 0.77
Net earnings per share attributable to shareholders, continuing operations - diluted (in dollars per share) $ 0.06 $ 0.75
Discontinued operations $ (146,802) $ (6,352)
Previously Reported [Member]    
Disclosure of reclassifications or changes in presentation [line items]    
Depreciation   246,651
Income tax expense   79,134
Net (loss) earnings for the year   97,361
Continuing operations   110,893
Shareholders of the Company   $ 103,210
Net earnings per share attributable to shareholders - basic (in dollars per share)   $ 0.61
Net earnings per share attributable to shareholders - diluted (in dollars per share)   0.60
Net earnings per share attributable to shareholders, continuing operations - basic (in dollars per share)   0.65
Net earnings per share attributable to shareholders, continuing operations - diluted (in dollars per share)   $ 0.64
Discontinued operations   $ 6,352
Net earnings per share attributable to shareholders, discontinued operations (in dollars per share)   $ 0.04
Revision of Prior Period, Adjustment [Member]    
Disclosure of reclassifications or changes in presentation [line items]    
Depreciation   $ (28,522)
Income tax expense   8,267
Net (loss) earnings for the year   20,254
Continuing operations   20,254
Shareholders of the Company   $ 20,254
Net earnings per share attributable to shareholders - basic (in dollars per share)   $ 0.12
Net earnings per share attributable to shareholders - diluted (in dollars per share)   0.11
Net earnings per share attributable to shareholders, continuing operations - basic (in dollars per share)   0.12
Net earnings per share attributable to shareholders, continuing operations - diluted (in dollars per share)   $ 0.11