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Financial obligations - Total financial obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial obligations      
Beginning balance $ 571,688 $ 587,062  
New financial obligations 0 161,894 $ 0
New lease obligations 5,213 19,885 0
Disposals of lease obligations (977) (5,079) 0
Payments of financial obligations (38,994) (186,152) (45,222)
Payments of obligations for leases (4,080) (7,596) 0
Amortization of debt issuance costs in results, note 27(a) 976 2,109 1,024
Accretion expense for leases related to rights in use, nota 27(a) 180 293 0
Effect of amortized cost, note 27(a) (361) 0 0
Increase of debt issuance costs (1,992) (728) (2,207)
Other minor     384
Final balance $ 531,653 $ 571,688 $ 587,062