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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 |  |

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