PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details)	1 Months Ended	3 Months Ended			12 Months Ended
	Jan. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) power_generator	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Proceeds from various assets sold					$ 10,200,000
Number of assets sold | power_generator					15
Impairments		$ 1,600,000			$ 1,643,000	$ 1,300,719,000	$ 0
Gathering, processing, and transmission systems and facilities
Property, Plant and Equipment [Line Items]
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			18,200,000
Power Generator
Property, Plant and Equipment [Line Items]
Fair value of property, plant and equipment		$ 2,300,000			2,300,000
Finance lease, term of contract								1 year
Payment to exercise purchase option	$ 9,800,000
Depreciation on finance lease assets					0	5,000,000.0
Financing lease assets, interest					$ 0	$ 900,000