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OTHER FINANCIAL ITEMS (Summary of Other Financial Items) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Other Financial Items [Abstract] |  |
Net cash movement on non-designated derivatives and swap settlements | $ (3,558) | $ (5,756)
Net increase/(decrease) in fair value of non-designated derivatives | 6,937 | (25,864)
Allowance for expected credit losses | 716 | (68)
Other items | (338) | 105
Total other financial items, net | $ 3,757 | $ (31,583)

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