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FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities $ 41 $ 41
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 41 41
Derivatives - Energy Related Assets 56,314 61,190
Total Assets 56,355 61,231
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 48,465 31,390
Derivatives - Other 14,973 7,873
Total Liabilities 63,438 39,263
Fair Value, Measurements, Recurring | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 13,893 5,479
Total Assets 13,893 5,479
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 7,986 2,189
Derivatives - Other 8,996 5,867
Total Liabilities 16,982 8,056
Fair Value, Measurements, Recurring | Level 1    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 41 41
Derivatives - Energy Related Assets 10,262 9,955
Total Assets 10,303 9,996
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 22,365 7,291
Derivatives - Other 0 0
Total Liabilities 22,365 7,291
Fair Value, Measurements, Recurring | Level 1 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 4,929 348
Total Assets 4,929 348
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 5,924 1,035
Derivatives - Other 0 0
Total Liabilities 5,924 1,035
Fair Value, Measurements, Recurring | Level 2    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 20,230 23,429
Total Assets 20,230 23,429
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 12,139 12,354
Derivatives - Other 14,973 7,873
Total Liabilities 27,112 20,227
Fair Value, Measurements, Recurring | Level 2 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 17 126
Total Assets 17 126
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 1,356 1,077
Derivatives - Other 8,996 5,867
Total Liabilities 10,352 6,944
Fair Value, Measurements, Recurring | Level 3    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 25,822 27,806
Total Assets 25,822 27,806
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 13,961 11,745
Derivatives - Other 0 0
Total Liabilities 13,961 11,745
Fair Value, Measurements, Recurring | Level 3 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 8,947 5,005
Total Assets 8,947 5,005
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 706 77
Derivatives - Other 0 0
Total Liabilities $ 706 $ 77