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BUSINESS COMBINATIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Jul. 01, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Combination, Separately Recognized Transactions [Line Items]              
Payments to acquire businesses   $ 1,720,000          
Working capital adjustment   24,700          
Goodwill deductible for tax purposes   700,300   $ 599,700   $ 599,700  
ETG and ELK revenues included in the Company's unaudited consolidated statements of income       31,500   220,900  
ETG and ELK earnings included in the Company's unaudited consolidated statements of income       (10,000)   17,400  
AEP              
Business Combination, Separately Recognized Transactions [Line Items]              
Consideration paid for AEP $ 4,000            
New Jersey Board of Public Utilities | ETG Utility Operations              
Business Combination, Separately Recognized Transactions [Line Items]              
Requested recovery of investment costs not yet approved     $ 300,000        
ETG Utility Operations              
Business Combination, Separately Recognized Transactions [Line Items]              
Payments to acquire businesses   1,710,000          
Credits due to customers under conditions of approval   15,000          
ELK Utility Operations              
Business Combination, Separately Recognized Transactions [Line Items]              
Payments to acquire businesses   10,900          
Credits due to customers under conditions of approval   $ 300          
AEP              
Business Combination, Separately Recognized Transactions [Line Items]              
ETG and ELK revenues included in the Company's unaudited consolidated statements of income       $ 100      
ETG and ELK earnings included in the Company's unaudited consolidated statements of income           $ 100  
Elizabethtown Gas and Elkton Gas              
Business Combination, Separately Recognized Transactions [Line Items]              
Business Combination, Acquisition Related Costs         $ 18,900   $ 32,100