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FINANCIAL INSTRUMENTS - Schedule of Estimated Fair Values and Carrying Values of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Estimated fair values of long-term debt $ 3,302,062 $ 3,152,224
Carrying amounts of long-term debt, including current maturities (A) 3,206,195 2,919,201
Net of:    
Unamortized debt issuance costs 40,104 29,574
Unamortized debt discounts 5,202 5,224
Finance lease, lease liability 3,100 3,100
SJG    
Debt Instrument [Line Items]    
Estimated fair values of long-term debt 1,121,257 1,197,052
Carrying amounts of long-term debt, including current maturities (A) 1,066,749 1,069,089
Net of:    
Unamortized debt issuance costs $ 9,197 $ 9,357