PROPERTY, PLANT & EQUIPMENT (Capitalized Interest Costs and Total Interest Costs Incurred) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PROPERTY, PLANT & EQUIPMENT [Abstract]
Capitalized interest cost	$ 3,487	$ 3,896	$ 3,674
Total interest cost incurred before recognition of the capitalized amount	$ 139,447	$ 134,051	$ 141,651