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Trade and other receivables, net - Summary of trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-current    
Trade receivables $ 6,597 $ 1,802
Advances to suppliers 2,363 1,930
Income tax credits 6,955 7,472
Non-income tax credits 1,863 1,853
Judicial deposits 3,191 3,280
Other receivables 1,138 1,075
Trade and other receivables, net 22,107 17,412
Current    
Trade receivables 52,294 69,017
Prepaid expenses 11,565 8,302
Advances to suppliers 36,497 21,451
Income tax credits 2,046 7,116
Non-income tax credits 38,865 43,572
Cash collateral 380 3,546
Receivables from related parties (Note 31) 176 172
Other receivables 8,284 4,352
Subtotal 97,813 88,511
Trade and other receivables, net 150,107 157,528
Trade and other receivables 172,214 174,940
Reclassified from Property, plant and equipment 1,086 1,499
Gross | Trade receivables excluding related party    
Current    
Trade receivables 43,078 61,546
Gross | Trade receivables related party    
Current    
Trade receivables 10,218 8,114
Allowance for trade receivables    
Current    
Trade receivables $ (1,002) $ (643)