DEFERRED REVENUE (SCHEDULE OF CHANGES IN DEFERRED REVENUE) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
DEFERRED REVENUE AND COSTS [ABSTRACT]
Deferred Revenue, Beginning Balance	$ 78,173
Deferred Revenue, Additions	139,021
Amortization	154,605
Deferred Revenue, Ending Balance	$ 62,589