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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ in Thousands, DTH in Millions
1 Months Ended 3 Months Ended
Oct. 11, 2019
USD ($)
DTH
Feb. 07, 2019
USD ($)
Nov. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
mi
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]            
Payments for asset acquisitions         $ 368,126 $ 0
Clean Energy Ventures            
Business Acquisition [Line Items]            
Disposal group consideration   $ 208,600        
Gain on sale of business, net   $ 645        
Talen's Membership Interests In IEC | Talen Generation, LLC            
Business Acquisition [Line Items]            
Cash paid related to acquisition     $ 10,000      
Consideration to be transferred       $ 166,000    
Contingent consideration arrangements, range of outcomes, value, high       $ 23,000    
Pipeline length owned | mi         84  
Natural gas transportation capacity agreement, period         10 years  
NJR Pipeline | Leaf River Energy Center LLC            
Business Acquisition [Line Items]            
Percentage of voting interests acquired 100.00%          
Payments for asset acquisitions $ 367,500          
Natural gas capacity of acquiree | DTH 32.2          
Minimum            
Business Acquisition [Line Items]            
PP&E useful life         5 years  
Maximum            
Business Acquisition [Line Items]            
PP&E useful life         50 years