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EQUITY METHOD INVESTMENTS (Details) Mcf in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Mcf	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Mcf	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 20, 2019 Mcf mi	Nov. 07, 2019	Oct. 01, 2019	Jul. 30, 2019	Mar. 29, 2019 USD ($)	Feb. 15, 2019	Feb. 01, 2019
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 514,110		$ 514,110		$ 479,558
Income (expense) from equity method investment	$ (13,034)	$ (114)	$ (13,279)	$ (64)
Joint Venture of Wink to Webster Project
Schedule of Equity Method Investments [Line Items]
Member ownership percentage									4.00%
Gray Oak Pipeline, LLC \| 2.52% Short-Term Promissory Note
Schedule of Equity Method Investments [Line Items]
Borrowing amount										$ 123,000
Promissory note stated interest rate										2.52%
OMOG JV LLC \| Reliance Gathering
Schedule of Equity Method Investments [Line Items]
Percentage of interests acquired							100.00%
Amarillo Rattler, LLC \| Dawson, Martin And Andrews Counties, Texas
Schedule of Equity Method Investments [Line Items]
Distance of gathering and regional transportation pipelines (in miles) \| mi						84
EPIC Crude Holdings, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	10.00%		10.00%									10.00%
Equity method investments	$ 116,476		$ 116,476		109,806
Income (expense) from equity method investment	$ (616)	(3)	$ (2,799)	(3)
Gray Oak Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	10.00%		10.00%								10.00%
Equity method investments	$ 135,342		$ 135,342		115,840
Income (expense) from equity method investment	$ 1,171	(111)	$ 1,753	(61)
Wink to Webster Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	4.00%		4.00%
Equity method investments	$ 60,121		$ 60,121		34,124
Income (expense) from equity method investment	$ 12	0	$ 200	0
OMOG JV LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	60.00%		60.00%					60.00%
Equity method investments	$ 198,146		$ 198,146		219,098
Income (expense) from equity method investment	(13,514)	0	(12,180)	0
Goodwill impairment charge	$ 15,800		$ 15,800
Amarillo Rattler, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	50.00%		50.00%			50.00%
Equity method investments	$ 4,025		$ 4,025		$ 690
Income (expense) from equity method investment	$ (87)	$ 0	$ (253)	$ 0
Gas gathering and cryogenic processing system capacity (in Mcf/d) \| Mcf	30		30
Amarillo Rattler, LLC \| Dawson, Martin And Andrews Counties, Texas
Schedule of Equity Method Investments [Line Items]
Gas gathering and cryogenic processing system capacity (in Mcf/d) \| Mcf						40
Amarillo Rattler, LLC \| Martin County, Texas
Schedule of Equity Method Investments [Line Items]
Gas gathering and cryogenic processing system capacity (in Mcf/d) \| Mcf						60