SUBSEQUENT EVENTS - Additional Information (Details) - $ / shares			3 Months Ended								12 Months Ended
	Mar. 16, 2020	Feb. 24, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Distributions declared per Class A unit (in dollars per share)			$ 0.03	$ 3.13	$ 1.05	$ 0.75	$ 0.70	$ 0.55	$ 0.96	$ 0.76	$ 4.96	$ 2.97	$ 3.21
Class A Units | Subsequent Event
Subsequent Event [Line Items]
Distributions declared per Class A unit (in dollars per share)		$ 0.22
Forecast | Series A Preferred Units | Subsequent Event
Subsequent Event [Line Items]
Distributions declared per preferred unit (in dollars per share)	$ 0.414063
Forecast | Series B Preferred Units | Subsequent Event
Subsequent Event [Line Items]
Distributions declared per preferred unit (in dollars per share)	$ 0.409375