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STOCK-BASED COMPENSATION PLAN - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Feb. 23, 2022
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Service period of shares (in years) 3 years    
Number of options granted (in shares) 0 0  
Number of options outstanding (in shares) 0 0  
Expected volatility, measurement period 3 years    
Unrecognized compensation cost of awards granted under the plan $ 10.4    
Weighted average period over which unrecognized compensation cost is to be recognized. 2 years 2 months 12 days    
NJ Boardwalk Holdings LLC      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Merger agreement, sale price per share (in dollars per share)     $ 36.00
Directors      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of shares 12 months    
Director shares vested 100.00%    
Time-based Restricted Stock | Year one      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Service period of shares (in years) 1 year    
Time-based Restricted Stock | Year two      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Service period of shares (in years) 2 years    
Time-based Restricted Stock | Year three      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Service period of shares (in years) 3 years    
Time-based Restricted Stock | Officers & Key Employees      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of shares 3 years    
Payout limit of vested shares 100.00%    
Number of shares awarded (in shares)   110,891  
Fair value of shares awarded $ 2.3 $ 2.7  
Time-based Restricted Stock | Officers & Key Employees | Year one      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting percentage 33.33%    
Time-based Restricted Stock | Officers & Key Employees | Year two      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting percentage 33.33%    
Time-based Restricted Stock | Officers & Key Employees | Year three      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting percentage 33.33%    
Performance-based Restricted Shares | Officers & Key Employees      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of shares 3 years    
Restricted Stock | Officers & Key Employees      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of shares granted (in shares) 184,935 0  
Restricted Stock | Officers & Key Employees | South Jersey Gas Company      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of shares granted (in shares) 21,784 0  
Restricted Stock | Officers & Key Employees | Minimum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Percentage of actual amount of shares that ultimately vest of original share units granted 0.00%    
Restricted Stock | Officers & Key Employees | Maximum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Percentage of actual amount of shares that ultimately vest of original share units granted 200.00%    
Restricted Stock | Directors      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of shares granted (in shares) 0 0  
Stock Appreciation Rights (SARs)      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of shares granted (in shares) 0 0  
Performance Shares      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of shares 3 years