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CURRENT AND DEFERRED TAXES (Details 7) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Tax expense using the legal rate | [1] | $ 95,425 | $ 65,449 | $ (89,472)
Tax effect by change in tax rate | [1] | 897 |  |
Tax effect of rates in other jurisdictions |  | 42,326 | 16,333 | (21,803)
Tax effect of non-taxable operating revenues |  | (44,593) | (62,419) | (106,381)
Tax effect of disallowable expenses |  | 35,481 | 132,469 | 38,677
Tax effect of the use of tax losses not previously recognized |  | 211 |  |
Other increases (decreases) in legal tax charge |  | 43,757 | 11,372 | 596
Total adjustments to tax expense using the legal rate |  | 78,079 | 97,755 | (88,911)
Tax expense using the effective rate |  | $ 173,504 | $ 163,204 | $ (178,383)
Reconciliation of average effective tax rate and applicable tax rate [abstract] |  |  |  |
Tax expense using the legal rate, percent | [1] | 25.50% | 24.00% | 22.50%
Tax effect by change in tax rate, percent | [1] | 0.24% |  |
Tax effect of rates in other jurisdictions, percent |  | 11.31% | 5.99% | 5.48%
Tax effect of non-taxable operating revenues, percent |  | (11.92%) | (22.89%) | 26.75%
Tax effect of disallowable expenses, percent |  | 9.48% | 48.58% | (9.73%)
Tax effect of the use of tax losses not previously recognized, percent |  | 0.06% |  |
Other increases (decreases) in legal tax charge, percent |  | 11.69% | 4.17% | (0.15%)
Total adjustments to tax expense using the legal rate, percent |  | 20.86% | 35.85% | 22.35%
Tax expense using the effective rate, percent |  | 46.36% | 59.85% | 44.85%
[1] | On September 29, 2014, Law No. 20,780 "Amendment to the system of income taxation and introduces various adjustments in the tax system." was published in the Official Journal of the Republic of Chile. Within major tax reforms that this law contains, the First-Category Tax rate is gradually modified from 2014 to 2018 and should be declared and paid in tax year 2015.

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_23_h&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_viii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_79&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_d&doctype=Standard -URIDate 2017-03-09 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_g&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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