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SUBSEQUENT EVENTS (Details) - USD ($)
Apr. 06, 2020
Apr. 03, 2020
Apr. 30, 2020
Apr. 16, 2020
Mar. 31, 2020
Line of Credit          
Subsequent Event [Line Items]          
Total Facility         $ 1,210,000,000
Line of Credit | SJG          
Subsequent Event [Line Items]          
Total Facility         210,000,000
Line of Credit | Revolving Credit Facility | ETG          
Subsequent Event [Line Items]          
Total Facility         $ 250,000,000.0
Subsequent event          
Subsequent Event [Line Items]          
Repayments of debt   $ 200,000,000.0      
Subsequent event | ATM Equity Offering Sales Agreement          
Subsequent Event [Line Items]          
Price per share (in dollars per share) $ 1.25        
Consideration received $ 200,000,000.0        
Subsequent event | Line of Credit | Revolving Credit Facility | ETG And SJIU          
Subsequent Event [Line Items]          
Total Facility     $ 200,000,000.0    
Subsequent event | Line of Credit | Revolving Credit Facility | ETG          
Subsequent Event [Line Items]          
Total Facility     190,000,000.0    
Subsequent event | Line of Credit | Revolving Credit Facility | SJIU          
Subsequent Event [Line Items]          
Total Facility     $ 10,000,000.0    
Subsequent event | Credit Agreement | Unsecured Term Loan          
Subsequent Event [Line Items]          
Total Facility   $ 200,000,000.0      
Subsequent event | Senior Secured Notes, Series F, 2020 | Senior Secured Notes | SJG          
Subsequent Event [Line Items]          
Principal amount issued       $ 525,000,000.0  
Subsequent event | Senior Secured Notes, Series F, 2020 | Senior Secured Notes | Tranche A and B | SJG          
Subsequent Event [Line Items]          
Principal amount issued       $ 400,000,000.0