ACCOUNTING POLICIES AND PRONOUNCEMENTS (Schedule of Contract with Customer, Asset and Liability) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 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	0
Ending balance	(35,834)
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	179,179
Consideration earned during the period	(58,946)
Consideration received during the period	141,166
Ending balance	$ 261,399