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FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Available-for-Sale Securities $ 36 $ 36
Derivatives - Energy Related Assets 34,175 48,127
Total Assets 34,211 48,163
Liabilities    
Derivatives - Energy Related Liabilities 14,225 52,963
Derivatives - Other 6,695 10,370
Total Liabilities 20,920 63,333
SJG    
Assets    
Derivatives - Energy Related Assets 6,726 7,332
Total Assets 6,726 7,332
Liabilities    
Derivatives - Energy Related Liabilities 1,064 9,440
Derivatives - Other 5,600 7,028
Total Liabilities 6,664 16,468
Level 1    
Assets    
Available-for-Sale Securities 36 36
Derivatives - Energy Related Assets 1,808 5,155
Total Assets 1,844 5,191
Liabilities    
Derivatives - Energy Related Liabilities 3,107 10,687
Derivatives - Other 0 0
Total Liabilities 3,107 10,687
Level 1 | SJG    
Assets    
Derivatives - Energy Related Assets 729 208
Total Assets 729 208
Liabilities    
Derivatives - Energy Related Liabilities 390 1,750
Derivatives - Other 0 0
Total Liabilities 390 1,750
Level 2    
Assets    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 8,581 21,869
Total Assets 8,581 21,869
Liabilities    
Derivatives - Energy Related Liabilities 5,693 24,283
Derivatives - Other 6,695 10,370
Total Liabilities 12,388 34,653
Level 2 | SJG    
Assets    
Derivatives - Energy Related Assets 0 230
Total Assets 0 230
Liabilities    
Derivatives - Energy Related Liabilities 674 2,848
Derivatives - Other 5,600 7,028
Total Liabilities 6,274 9,876
Level 3    
Assets    
Available-for-Sale Securities 0 0
Derivatives - Energy Related Assets 23,786 21,103
Total Assets 23,786 21,103
Liabilities    
Derivatives - Energy Related Liabilities 5,425 17,993
Derivatives - Other 0 0
Total Liabilities 5,425 17,993
Level 3 | SJG    
Assets    
Derivatives - Energy Related Assets 5,997 6,894
Total Assets 5,997 6,894
Liabilities    
Derivatives - Energy Related Liabilities 0 4,842
Derivatives - Other 0 0
Total Liabilities $ 0 $ 4,842