SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Contract with Customer, Asset and Liability) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Change In Contract With Customer, Asset [Roll Forward]
Beginning balance	$ 0
Consideration earned during the period	(35,834)
Consideration received during the period	35,834
Ending balance	0
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	179,179
Consideration earned during the period	(308,898)
Consideration received during the period	426,215
Ending balance	$ 296,496