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PROPERTY, PLANT AND EQUIPMENT (Details 7) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment [abstract]      
Average rate of capitalization of capitalized interest costs 4.62% 4.12% 3.54%
Costs of capitalized interest $ 15,398 $ 8,210 $ (696)