PROPERTY, PLANT & EQUIPMENT (Capitalized Interest Costs and Total Interest Costs Incurred) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
PROPERTY, PLANT & EQUIPMENT [Abstract]
Capitalized interest cost	$ 5,177	$ 7,468	$ 2,930
Total interest cost incurred before recognition of the capitalized amount	$ 300,699	$ 141,544	$ 223,518