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LINES OF CREDIT (Details) - Line of Credit
6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Line of Credit Facility [Line Items]    
Total Facility $ 610,000,000  
Usage 149,000,000  
Available Liquidity $ 461,000,000  
Weighted average interest rate on borrowings (as a percent) 1.43% 0.96%
Average borrowings outstanding during the period $ 325,500,000 $ 274,300,000
Maximum amounts outstanding during the period $ 467,700,000 $ 368,100,000
Financial covenant, ratio of indebtedness to consolidated total capitalization (not more than) 0.65  
SJG Commercial Paper Program    
Line of Credit Facility [Line Items]    
Total Facility $ 200,000,000  
Fixed maturities of notes, at maximum number of days (in days) 270 days  
South Jersey Gas Company    
Line of Credit Facility [Line Items]    
Total Facility $ 210,000,000  
Usage 14,100,000  
Available Liquidity 195,900,000  
South Jersey Gas Company | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Total Facility 200,000,000  
Usage 14,100,000  
Available Liquidity 185,900,000  
South Jersey Gas Company | Uncommitted Bank Line    
Line of Credit Facility [Line Items]    
Total Facility 10,000,000  
Usage 0  
Available Liquidity 10,000,000  
South Jersey Industries Inc    
Line of Credit Facility [Line Items]    
Total Facility 400,000,000  
Usage 134,900,000  
Available Liquidity 265,100,000  
South Jersey Industries Inc | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Total Facility 400,000,000  
Usage 134,900,000  
Available Liquidity 265,100,000  
Letters of credit outstanding 2,800,000  
Revolving Credit Facility | South Jersey Gas Company    
Line of Credit Facility [Line Items]    
Letters of credit outstanding $ 800,000