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Financial obligations - Total financial obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial obligations      
Beginning balance $ 531,653 $ 571,688 $ 587,062
Additions 550,000 0 0
Debt issuance costs (10,700) 0 0
Amortization of debt issuance costs in results, note 29(a) 717 0 0
Additions 0 0 161,894
Payments of financial obligations (21,585) (38,994) (186,152)
Effect of amortized cost, note 29(a) 8,837 (361) 0
Amortization of debt issuance costs in results, note 29(a) 885 976 2,109
Increase (reduction) of debt restructuring costs (225) 1,992 728
Additions 2,972 5,213 19,885
Accretion expense for leases related to rights in use, note 29(a) 176 180 293
Payments (5,205) (4,080) (7,596)
Disposals of lease obligations   (977) (5,079)
Final balance $ 1,057,975 $ 531,653 $ 571,688