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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 22, 2019
Jan. 31, 2019
Jan. 15, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]            
Long-term debt       $ 2,867,764 $ 1,204,173  
Repayments of debt       768,909 293,309 $ 49,366
Bank of America, N.A. | Common Stock | Private Placement | Subsequent Event            
Subsequent Event [Line Items]            
Shares delivered to settle derivative     6,779,661      
Proceeds from derivatives     $ 189,000      
Series 2018D Notes at variable rates due 2019 | Senior notes | South Jersey Industries Inc.            
Subsequent Event [Line Items]            
Long-term debt       $ 475,000 $ 0  
Series 2018D Notes at variable rates due 2019 | Senior notes | South Jersey Industries Inc. | Subsequent Event            
Subsequent Event [Line Items]            
Repayments of debt $ 125,000 $ 150,000