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INCOME TAX EXPENSE (Reconciliation of effective income tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income tax [Abstract]      
Income before income tax $ 1,159,359 $ 826,564 $ 2,031,567
Income tax expense at statutory tax rate (350,896) (247,592) (604,493)
Non taxable income 118,540 71,101 102,870
Non deductible expenses 0 (476) (16,201)
Effect of currency translation on tax base (66,157) 33,133 161,536
Increase of unrecognized tax losses carried-forward 0 (73,842) 0
Recovery of income tax 7,025 0 15,449
Effect of changes in tax law 0 21,157 (28,596)
Income tax expense $ (291,488) $ (196,519) $ (369,435)