FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Quantitative Information Regarding Significant Unobservable Inputs (Details) - Forward Contracts - Discounted Cash Flow - Level 3 - Natural Gas $ in Thousands	Mar. 31, 2022 USD ($) $ / decatherm	Dec. 31, 2021 USD ($) $ / decatherm
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Assets | $	$ 17,384	$ 8,916
Liabilities | $	19,614	8,107
South Jersey Gas Company
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Assets | $	12,258	3,638
Liabilities | $	$ 8	$ 0
Minimum | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	2.27	1.77
Minimum | South Jersey Gas Company | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	4.37	3.75
Maximum | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	12.20	8.30
Maximum | South Jersey Gas Company | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	11.52	5.66
Weighted Average | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	5.27	3.73
Weighted Average | South Jersey Gas Company | Forward price (per dt)
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Derivative, measurement input	6.92	4.94