SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Tax years subject to examination	We, or certain of our subsidiaries, file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. For U.S. federal and state purposes, tax years subject to examination are 2013 through 2016, according to standard statutes of limitations
Unrecognized tax benefits	$ 0	$ 0
Net income attributable to DERs for restricted unitholders	$ 200,000	$ 200,000
Dilutive securities	0	0