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OTHER REQUIRED DISCLOSURES (Statement of comprehensive income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of analysis of other comprehensive income by item [line items]    
Other comprehensive income, net of tax, change in value of foreign currency basis spreads $ (3,768,944) $ (3,707,019)
(Decrease) / Increase on change in value of currency translation adjustment (108,919) (61,925)
Reclassification of currency translation adjustment to income statement 0 0
Other comprehensive income, net of tax, change in value of foreign currency basis spreads (3,877,863) (3,768,944)
Cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Other comprehensive income, before tax, cash flow hedges, beginning balance (72) 679
Gains (losses) on cash flow hedges, before tax (454) (475)
Reclassification adjustments on cash flow hedges, before tax 188 (276)
Other comprehensive income, before tax, cash flow hedges, ending balance (338) (72)
Accumulated other comprehensive income, tax, beginning balance 23 (202)
Gains (losses) on cash flow hedges, tax 136 142
Reclassification adjustments on exchange differences on translation, tax (56) 83
Accumulated other comprehensive income, tax, ending balance 103 23
Other comprehensive income, net of tax, cash flow hedges, beginning balance (49) 477
Gains (losses) on cash flow hedges, net of tax (318) (333)
Reclassification adjustments on cash flow hedges, net of tax 132 (193)
Other comprehensive income, net of tax, cash flow hedges, ending balance $ (235) $ (49)