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CURRENT AND DEFERRED TAXES (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
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.