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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
NJNG    
Derivative [Line Items]    
Broker margin - Current assets $ 0 $ 4,822
Broker margin - Current (liabilities) (5,294) 0
NJRES    
Derivative [Line Items]    
Broker margin - Current assets $ 79,118 $ 42,822