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FINANCIAL INSTRUMENTS - Schedule of Estimated Fair Values and Carrying Values of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Estimated fair values of long-term debt $ 2,836,407 $ 2,734,745
Carrying amounts of long-term debt, including current maturities 2,674,441 2,537,995
Unamortized debt issuance costs 29,168 25,547
Unamortized debt discounts 5,246 5,313
SJG    
Debt Instrument [Line Items]    
Estimated fair values of long-term debt 1,035,948 915,248
Carrying amounts of long-term debt, including current maturities 952,116 965,100
Unamortized debt issuance costs $ 9,239 $ 6,284