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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Apr. 07, 2021
Sep. 09, 2020
Dec. 31, 2021
Site Contingency [Line Items]        
Manufactured gas plant remediation $ 135,012     $ 126,872
Recovery from third party of environmental remediation cost, period       7 years
Regulatory assets 522,099     $ 528,074
Expended, net of recoveries        
Site Contingency [Line Items]        
Regulatory assets       64,700
RAC        
Site Contingency [Line Items]        
Approved rate, amount   $ 11,100 $ 9,700  
Approved rate increase (decrease), amount $ 2,000      
Minimum        
Site Contingency [Line Items]        
Product liability contingency, loss exposure in excess of accrual, best estimate       115,700
Maximum        
Site Contingency [Line Items]        
Product liability contingency, loss exposure in excess of accrual, best estimate       $ 178,700