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FOREIGN CURRENCY AND EXCHANGE RATE DIFFERENCES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]    
Cash and cash equivalents $ 260,092 $ 201,416
Other financial assets, current 36,484 14,573
Other non-financial assets, current 107,170 107,789
Trade and other accounts receivable, current 373,447 251,204
Accounts receivable from related entities, current 958 554
Tax current assets 33,575 28,198
Total current assets 811,726 603,734
Other financial assets, non-current 20,975 26,772
Other non-financial assets, non-current 9,108 19,069
Accounts receivable, non-current 6,887 7,356
Deferred tax assets 2,081 2,110
Total non-current assets 39,051 55,307
Argentina, Pesos    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 7,309 4,438
Other financial assets, current 21 12
Other non-financial assets, current 16,507 16,086
Trade and other accounts receivable, current 49,680 54,356
Tax current assets 1,679 1,798
Total current assets 75,196 76,690
Other financial assets, non-current  
Other non-financial assets, non-current 172 142
Total non-current assets 172 142
Brazil, Brazil Real    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 14,242 9,705
Other financial assets, current 17 734
Other non-financial assets, current 19,686 20,158
Trade and other accounts receivable, current 22,006 30,675
Tax current assets 3,934 2,462
Total current assets 59,885 63,734
Other financial assets, non-current 3,831 2,769
Other non-financial assets, non-current 6,368 6,029
Total non-current assets 10,199 8,798
Chile, Pesos    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 81,693 30,221
Other financial assets, current 26,605 585
Other non-financial assets, current 34,258 1,619
Trade and other accounts receivable, current 82,369 90,482
Accounts receivable from related entities, current 735 554
Tax current assets 3,317 6,333
Total current assets 228,977 129,794
Other financial assets, non-current 74 83
Accounts receivable, non-current 6,887 7,356
Total non-current assets 6,961 7,439
Colombia, Pesos    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 1,105 1,137
Other financial assets, current 150
Other non-financial assets, current 340 713
Trade and other accounts receivable, current 1,169 9,720
Tax current assets 660 1,418
Total current assets 3,424 12,988
Other financial assets, non-current 281 285
Deferred tax assets 86 117
Total non-current assets 367 402
Euro Member Countries, Euro    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 11,746 1,695
Other non-financial assets, current 2,722 1,563
Trade and other accounts receivable, current 48,286 21,923
Tax current assets 179 273
Total current assets 62,933 25,454
Other financial assets, non-current 7,853 6,966
Total non-current assets 7,853 6,966
United States of America, Dollars    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 108,327 128,694
Other financial assets, current 9,343 12,879
Other non-financial assets, current 21,907 50,157
Trade and other accounts receivable, current 34,268 14,086
Accounts receivable from related entities, current 223  
Tax current assets 327 177
Total current assets 174,395 205,993
Other financial assets, non-current 7,273 14,920
Other non-financial assets, non-current 38 8,309
Accounts receivable, non-current  
Total non-current assets 7,311 23,229
Peru, Nuevos Soles    
Disclosure of subsidiaries [line items]    
Tax current assets 21,948 14,387
Other currency    
Disclosure of subsidiaries [line items]    
Cash and cash equivalents 35,670 25,526
Other financial assets, current 348 363
Other non-financial assets, current 11,750 17,493
Trade and other accounts receivable, current 135,669 29,962
Tax current assets 1,531 1,350
Total current assets 206,916 89,081
Other financial assets, non-current 1,663 1,749
Other non-financial assets, non-current 2,530 4,589
Accounts receivable, non-current  
Deferred tax assets 1,995 1,993
Total non-current assets $ 6,188 $ 8,331