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Trade and other receivables, net - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Non-current    
Advances to suppliers $ 723 $ 2,343
Income tax credits 5,240 4,429
Non-income tax credits 16,895 15,998
Judicial deposits 2,596 2,908
Receivable from disposal of subsidiary 17,047 10,944
Other receivables 2,492 2,198
Non-current portion 44,993 38,820
Current    
Trade receivables (51,498) (66,001)
Prepaid expenses 12,521 9,396
Advances to suppliers 14,417 43,365
Income tax credits 1,059 2,560
Non-income tax credits 33,363 28,232
Receivable from disposal of subsidiary (Note 22) 5,716 3,709
Cash collateral 23 1,505
Receivables from related parties (Note 33) 0 324
Other receivables 8,741 3,594
Subtotal 75,840 92,685
Trade and other receivables, net 127,338 158,686
Trade and other receivables 172,331 197,506
Reclassified from Property, plant and equipment 226 575
Gross | Trade receivables excluding related party    
Current    
Trade receivables (55,271) (60,167)
Gross | Trade receivables related party    
Current    
Trade receivables 0 (8,337)
Allowance for trade receivables    
Current    
Trade receivables $ (3,773) $ (2,503)