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Trade and other receivables, net - Movement of allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Available for Sale Assets Explanatory [Abstract]      
Beginning balance $ 32,102 $ 32,184 $ 31,607
Provision for other receivable, note 26 25 1,334 0
Provision for trade receivables, note 24   18 676
Provision of the period 25 1,352 676
Write off of the period (162) (410) 0
Exchange difference 57 (173) 0
Reversals of the period, note 26   (45) (99)
Other minor   (806) 0
Final balance 32,022 32,102 32,184
Trade receivables 22,016 [1] 22,013 [1] 22,823
Other receivables $ 10,006 $ 10,089 $ 9,361
[1] (f)Below is presented the movement in the allowance for expected credit losses: