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FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities $ 40 $ 40
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 40 40
Derivatives - Energy Related Assets 44,642 60,135
Total Assets 44,682 60,175
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 35,994 50,171
Derivatives - Other 20,225 12,660
Total Liabilities 56,219 62,831
Fair Value, Measurements, Recurring | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 7,633 16,909
Total Assets 7,633 16,909
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 6,717 14,766
Derivatives - Other 11,375 7,856
Total Liabilities 18,092 22,622
Fair Value, Measurements, Recurring | Level 1    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 40 40
Derivatives - Energy Related Assets 4,413 16,931
Total Assets 4,453 16,971
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 23,449 34,446
Derivatives - Other 0 0
Total Liabilities 23,449 34,446
Fair Value, Measurements, Recurring | Level 1 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 2,711 11,860
Total Assets 2,711 11,860
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 6,700 14,565
Derivatives - Other 0 0
Total Liabilities 6,700 14,565
Fair Value, Measurements, Recurring | Level 2    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 14,378 17,841
Total Assets 14,378 17,841
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 5,672 7,936
Derivatives - Other 20,225 12,660
Total Liabilities 25,897 20,596
Fair Value, Measurements, Recurring | Level 2 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 110 0
Total Assets 110 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 11 187
Derivatives - Other 11,375 7,856
Total Liabilities 11,386 8,043
Fair Value, Measurements, Recurring | Level 3    
Assets, Fair Value Disclosure [Abstract]    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 25,851 25,363
Total Assets 25,851 25,363
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 6,873 7,789
Derivatives - Other 0 0
Total Liabilities 6,873 7,789
Fair Value, Measurements, Recurring | Level 3 | SJG    
Assets, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Assets 4,812 5,049
Total Assets 4,812 5,049
Liabilities, Fair Value Disclosure [Abstract]    
Derivatives - Energy Related Liabilities 6 14
Derivatives - Other 0 0
Total Liabilities $ 6 $ 14