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FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Available-for-Sale Securities $ 32 $ 32
Fair Value, Measurements, Recurring    
Assets    
Available-for-Sale Securities 32 32
Derivatives - energy related assets 108,621 48,374
Total assets 108,653 48,406
Liabilities    
Derivatives - energy related liabilities 81,675 31,953
Derivatives - other 8,444 9,938
Total liabilities 90,119 41,891
Fair Value, Measurements, Recurring | SJG    
Assets    
Derivatives - energy related assets 13,820 4,140
Total assets 13,820 4,140
Liabilities    
Derivatives - energy related liabilities 280 3,058
Derivatives - other 8,444 9,938
Total liabilities 8,724 12,996
Fair Value, Measurements, Recurring | Level 1    
Assets    
Available-for-Sale Securities 32 32
Derivatives - energy related assets 40,975 11,447
Total assets 41,007 11,479
Liabilities    
Derivatives - energy related liabilities 15,678 8,605
Derivatives - other 0 0
Total liabilities 15,678 8,605
Fair Value, Measurements, Recurring | Level 1 | SJG    
Assets    
Derivatives - energy related assets 8,148 715
Total assets 8,148 715
Liabilities    
Derivatives - energy related liabilities 259 2,891
Derivatives - other 0 0
Total liabilities 259 2,891
Fair Value, Measurements, Recurring | Level 2    
Assets    
Available-for-Sale Securities 0 0
Derivatives - energy related assets 58,292 23,527
Total assets 58,292 23,527
Liabilities    
Derivatives - energy related liabilities 61,599 20,954
Derivatives - other 8,444 9,938
Total liabilities 70,043 30,892
Fair Value, Measurements, Recurring | Level 2 | SJG    
Assets    
Derivatives - energy related assets 950 32
Total assets 950 32
Liabilities    
Derivatives - energy related liabilities 20 159
Derivatives - other 8,444 9,938
Total liabilities 8,464 10,097
Fair Value, Measurements, Recurring | Level 3    
Assets    
Available-for-Sale Securities 0 0
Derivatives - energy related assets 9,354 13,400
Total assets 9,354 13,400
Liabilities    
Derivatives - energy related liabilities 4,398 2,394
Derivatives - other 0 0
Total liabilities 4,398 2,394
Fair Value, Measurements, Recurring | Level 3 | SJG    
Assets    
Derivatives - energy related assets 4,722 3,393
Total assets 4,722 3,393
Liabilities    
Derivatives - energy related liabilities 1 8
Derivatives - other 0 0
Total liabilities $ 1 $ 8