ACCOUNTING POLICIES - Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net loss recognized on our proportionate share of the net losses of our equity method investees and amortization of the basis difference	$ 1,025	$ 350
Net loss recognized during the period on equity method securities sold	$ 524	$ 0