QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	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
Quarterly Financial Information Disclosure [Abstract]
Midstream services revenue — affiliate (Note 3)	$ 43,803,000	$ 34,009,000	$ 24,139,000	$ 33,847,000	$ 26,697,000	$ 25,437,000	$ 12,517,000	$ 12,099,000	$ 135,798,000	$ 76,750,000	$ 15,142,000
Operating income (loss)(2)	(1,278,497,000)	(6,583,000)	(4,942,000)	4,231,000	2,513,000	284,000	(7,468,000)	(7,570,000)	(1,285,791,000)	(12,241,000)	(11,534,000)
Net income (loss) before income taxes	(1,265,533,000)	(8,693,000)	(5,928,000)	6,154,000	4,014,000	284,000	(7,468,000)	(7,570,000)	(1,274,000,000)	(10,740,000)	(11,534,000)
Net income (loss) attributable to Class A common shareholders	$ (363,613,000)	$ (4,864,000)	$ (2,293,000)	$ 1,100,000	$ 632,000	$ 19,208,000	$ (11,621,000)	$ (12,607,000)	$ (369,670,000)	$ (4,388,000)	$ (18,575,000)
Net income (loss) attributable to Class A common shareholders, per share
Basic (in USD per share)	$ (4.85)	$ (0.06)	$ (0.03)	$ 0.01	$ 0.004	$ 0.09	$ (0.06)	$ (0.09)	$ (4.93)	$ (0.03)	$ (0.30)
Diluted (in USD per share)	$ (4.85)	$ (0.07)	$ (0.03)	$ 0.01	$ 0.004	$ 0.09	$ (0.06)	$ (0.09)	$ (4.93)	$ (0.03)	$ (0.30)
Condensed Income Statements, Captions [Line Items]
Impairments									$ 1,300,719,000	$ 0	$ 0
Construction in progress
Condensed Income Statements, Captions [Line Items]
Impairments		$ 9,300,000
Gathering, processing, and transmission systems and facilities
Condensed Income Statements, Captions [Line Items]
Impairments	$ 1,300,000,000