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CURRENT AND DEFERRED TAXES (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current tax expense      
Current tax expense $ 127,024 $ 87,307 $ 92,916
Adjustment to previous period's current tax 489 2,083 (395)
Total current tax expense, net 127,513 89,390 92,521
Deferred tax expense      
Deferred expense for taxes related to the creation and reversal of temporary differences 45,991 73,814 (270,904)
Reduction (increase) in value of deferred tax assets during the evaluation of its usefulness
Total deferred tax expense, net 45,991 73,814 (270,904)
Income tax expense $ 173,504 $ 163,204 $ (178,383)