UNIT REPURCHASE PLAN AND DISTRIBUTION REINVESTMENT PLAN (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 31, 2017
Class of Stock [Line Items]
Issued under the Distribution Reinvestment Plan (in units)	3,000
Partnership Units
Class of Stock [Line Items]
Maximum authorized for repurchase			$ 2,500,000.0
Repurchased (in shares)	16,542	18,101
Aggregate value repurchased	$ 1,200,000	$ 1,300,000
Registered for issuance under the Distribution Reinvestment Plan (in shares)	225,000
Issued under the Distribution Reinvestment Plan (in units)	3,069	122