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OTHER REQUIRED DISCLOSURES (Statement of comprehensive income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
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 | $ (3,257,038) | $ (3,152,645)
(Decrease) / Increase on change in value of currency translation adjustment | (449,981) | (104,393)
Reclassification of currency translation adjustment to income statement | 0 | 0
Other comprehensive income, net of tax, change in value of foreign currency basis spreads | (3,707,019) | (3,257,038)
Cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Other comprehensive income, before tax, cash flow hedges | 810 | 75
Gains (losses) on cash flow hedges, before tax | (14) | 363
Reclassification adjustments on cash flow hedges, before tax | (117) | 372
Other comprehensive income, before tax, cash flow hedges | 679 | 810
Accumulated other comprehensive income, tax | (129) | (22)
Gains (losses) on cash flow hedges, tax | (108) | 3
Reclassification adjustments on exchange differences on translation, tax | 35 | (110)
Accumulated other comprehensive income, tax | (202) | (129)
Other comprehensive income, net of tax, cash flow hedges | 681 | 53
Gains (losses) on cash flow hedges, net of tax | (122) | 366
Reclassification adjustments on cash flow hedges, net of tax | (82) | 262
Other comprehensive income, net of tax, cash flow hedges | $ 477 | $ 681

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