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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

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