ACQUISITIONS AND DISPOSITIONS - Net Assets Acquired (Details) - USD ($) $ in Thousands		3 Months Ended
	Oct. 11, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Purchase price		$ 368,126	$ 0
NJR Pipeline | Leaf River Energy Center LLC
Business Acquisition [Line Items]
Purchase price	$ 367,500
Net working capital adjustment	4,111
Transaction costs	1,664
Total consideration transferred	373,275
Identifiable assets acquired
Property, plant and equipment	365,715
Base gas	3,445
Other assets, net	4
Net working capital	4,111
Net assets acquired	$ 373,275