SEGMENT INFORMATION - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 60,848,000	$ 40,778,000
Adjustments related to MVC shortfall payments	(4,199,000)	0
Barnett Shale
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	1,453,000
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	300,000
Corporate and Other
Segment Reporting Information [Line Items]
Capital expenditures	17,000,000.0	9,600,000
Capital expenditures	16,101,000	297,000
Reportable Segments
Segment Reporting Information [Line Items]
Capital expenditures	44,747,000	40,481,000
Reportable Segments | Barnett Shale
Segment Reporting Information [Line Items]
Cash paid for capital expenditures	1,100
Capital expenditures	$ (118,000)	$ 37,000