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INCOME TAX EXPENSE (Reconciliation of effective income tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income tax [Abstract]      
Income before income tax $ 2,031,567 $ 1,359,809 $ 1,118,457
Income tax expense at statutory tax rate (604,493) (387,666) (324,592)
Non taxable income 102,870 16,232 606
Non deductible expenses (16,201) (24,070) (5,838)
Effect of currency translation on tax base 161,536 51,167 (81,042)
Recovery of income tax 15,449 0 0
Withholding tax on dividend distributions 0 0 (2,690)
Effect of changes in tax law (28,596) 7,455 2,028
Income tax expense $ (369,435) $ (336,882) $ (411,528)