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OTHER FINANCIAL AND NON-OPERATING ITEMS (Summary of Other Financial Items) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Other Financial Items [Abstract]      
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ (8,225) $ 0 $ 0
Net cash movement on non-designated derivatives 702 (647) (721)
Net (decrease)/increase in fair value of non-designated derivatives (6,316) 6,492 13,908
Other items (233) (133) (2,780)
Total other financial items, net $ (5,847) $ 5,712 $ 10,407