SEGMENT INFORMATION - Schedule of Adjustments Related to Minimum Volume Commitments Shortfall Payments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	$ 3,534	$ (2,999)	$ 2,868	$ (6,541)
Williston Basin
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	2,081	2,032	(1,387)	(1,354)
Piceance Basin
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments			(103)	(93)
Barnett Shale
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	$ 1,453	$ (5,031)	$ 4,358	$ (5,094)