REVENUES (Schedule of Contract with Customer, Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract Liabilities
Beginning balance	$ 246,010	$ 296,496
Consideration earned during the period	(55,696)	(490,137)
Consideration received during the period	170,102	439,651
Ending balance	$ 360,416	$ 246,010