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Financial obligations (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Financial obligations [Abstract]      
Beginning balance $ 633,083 $ 592,342 $ 353,710
Accrual of debt issuance costs in results, note 27(a) 1,024 909 0
Payments 45,222 32,599 33,476
Increase in interest for debt restructuring (2,207) 0 0
Exchange difference 384 (165) 17
New obligations 0 80,000 275,210
Accrual of debt issuance costs capitalized 0 272 (3,119)
Sale of asset under lease agreement 0 (7,196) 0
Increase of debt issuance costs, note 27(a) 0 (480) 0
Final balance $ 587,062 $ 633,083 $ 592,342