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DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details)
certificate in Thousands, $ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2020
USD ($)
certificate
Dec. 31, 2020
USD ($)
certificate
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Amortization of deferred hedge gains   $ 60  
Loss amortization into earnings   1,043 $ 759
Cash Flow Hedges      
Derivative [Line Items]      
Loss amortization into earnings   231 $ 0
Treasury Lock | Natural Gas Distribution      
Derivative [Line Items]      
Amount of (losses) gains recognized in income on derivatives $ (6,600)    
Foreign currency contracts      
Derivative [Line Items]      
Notional amount $ 5,100 $ 5,100  
Physical commodity contracts | Energy Services      
Derivative [Line Items]      
Number of SRECs (in certificates) | certificate 960 984  
Debt Issued In September 2020 | Natural Gas Distribution      
Derivative [Line Items]      
Debt issued $ 75,000    
Home Services and Other      
Derivative [Line Items]      
Debt issued 260,000    
Home Services and Other | Treasury Lock      
Derivative [Line Items]      
Amount of (losses) gains recognized in income on derivatives (13,700)    
Home Services and Other | Debt Issued In July 2020      
Derivative [Line Items]      
Debt issued 60,000    
Home Services and Other | Debt Issued In September 2020      
Derivative [Line Items]      
Debt issued $ 200,000