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CURRENT AND DEFERRED TAXES (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total current tax expense, net $ 127,513 $ 89,390 $ 92,521
Deferred tax expense, net, total 45,991 73,814 (270,904)
Income tax expense 173,504 163,204 (178,383)
Foreign [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total current tax expense, net 100,657 80,600 89,460
Deferred tax expense, net, total 21,846 119,175 (280,445)
Chile [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total current tax expense, net 26,856 8,790 3,061
Deferred tax expense, net, total $ 24,145 $ (45,361) $ 9,541