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PROPERTY, PLANT AND EQUIPMENT Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Impairments			$ 1,300,719,000	$ 0	$ 0
Proceeds from sale of assets	$ 13,300,000		13,309,000	$ 0	$ 0
Gathering, processing, and transmission systems and facilities
Property, Plant and Equipment [Line Items]
Cost capitalization			299,300,000
Impairments	1,300,000,000
Fair value of property, plant and equipment	$ 203,600,000		$ 203,600,000
Construction in progress
Property, Plant and Equipment [Line Items]
Impairments		$ 9,300,000
Fair value of property, plant and equipment		$ 18,200,000