ACCOUNTING POLICIES ACCOUNTING POLICIES - Schedule of Deferred Revenues (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Contract with Customer, Liability	$ 40,512	$ 50,578	$ 46,468
Increase (Decrease) in Contract with Customer, Liability	34,789	43,216
Contract with Customer, Liability, Revenue Recognized	$ (44,855)	$ (39,106)