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Capitalization (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 25, 2022
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2019
May 31, 2019
Feb. 28, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Aug. 31, 2019
Apr. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Aug. 31, 2018
Mar. 31, 2018
Schedule of Capitalization [Line Items]                                
Issuance of Common Stock       $ 43,700                        
Public offering, price per share       $ 60.50                        
Issuance of Common Stock in a public offering, shares       800,000                        
Additional Shares Authorized By SEC To Be Issued             300,000                  
Preferred Stock, Shares Authorized             120,000 120,000                
Preferred Stock, Shares Outstanding             20,000 20,000                
Long-term debt             $ 311,146 $ 277,241                
Other long term debt             212,300 129,600                
Customer advances             23,529 23,404                
First Mortgage Bonds - Series 2019A [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt             $ 32,500                  
Interest rate             4.00%                  
First Mortgage Bonds - Series 2019B [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt               $ 21,200                
Interest rate               5.00%                
All Long-term Debt [Member]                                
Schedule of Capitalization [Line Items]                                
Weighted average interest rate             2.83% 3.02%                
First Mortgage Bonds - Series 2020A [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt             $ 40,000                  
First Mortgage Bonds - Series 2021 [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt             65,000                  
Private placement loan [Member]                                
Schedule of Capitalization [Line Items]                                
Percentage of principal with stated interest rate   2.90%                            
Proceeds from private placement   $ 45,500                            
Maturity date   Nov. 30, 2051                            
Delaware State Revolving Fund [Member]                                
Schedule of Capitalization [Line Items]                                
Maximum borrowing amount                               $ 900
Delaware State Revolving Fund [Member]                                
Schedule of Capitalization [Line Items]                                
Maximum borrowing amount                         $ 10,000      
Maximum borrowing capacity, construction loan   $ 5,000                   $ 1,700        
Long-term debt             7,500                  
Maturity date   Nov. 30, 2044                            
Series 2018A [Member]                                
Schedule of Capitalization [Line Items]                                
Proceeds from issuance of first mortgage bond         $ 7,100                      
Amortizing Secured Notes [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt             47,600                  
New Jersey Economic Development Authority [Member]                                
Schedule of Capitalization [Line Items]                                
Long-term debt             $ 63,600                  
New Jersey Infrastructure Bank [Member]                                
Schedule of Capitalization [Line Items]                                
Maximum borrowing capacity, construction loan                           $ 8,700 $ 43,500  
Percentage of principal with stated interest rate             75.00%                  
Percentage of principal with market interest rate             25.00%                  
Long-term debt             $ 87,400                  
Interest rate             0.00%                  
Construction Loan [Member]                                
Schedule of Capitalization [Line Items]                                
Interest rate             0.00%                  
FMB [Member]                                
Schedule of Capitalization [Line Items]                                
Percentage of principal with stated interest rate   2.79% 2.90%                          
Proceeds from private placement   $ 19,500 $ 40,000                          
Maturity date   Nov. 30, 2041 Nov. 30, 2050                          
Amount of maximum redeem martgage bonds                   $ 45,500            
FMB [Member] | Series RR [Member]                                
Schedule of Capitalization [Line Items]                                
Amount of maximum redeem martgage bonds                   22,500            
FMB [Member] | Series SS [Member]                                
Schedule of Capitalization [Line Items]                                
Amount of maximum redeem martgage bonds                   $ 23,000            
New Jersey Board Of Public Utilities [Member]                                
Schedule of Capitalization [Line Items]                                
Proceeds from issuance of first mortgage bond             $ 100,000                  
Maturity date             Dec. 31, 2023                  
Tidewater [Member]                                
Schedule of Capitalization [Line Items]                                
Percentage of principal with stated interest rate             3.94%                  
Maturity date             Mar. 31, 2046                  
Other long term debt             $ 20,000                  
First Mortgage Bonds [Member]                                
Schedule of Capitalization [Line Items]                                
Maximum borrowing capacity, construction loan             $ 60,800       $ 53,700          
New Jersey Economic Development Authority [Member]                                
Schedule of Capitalization [Line Items]                                
Proceeds from issuance of first mortgage bond           $ 140,000                    
Maturity date           Dec. 31, 2022                    
Convertible Preferred Stock $7.00 Series [Member]                                
Schedule of Capitalization [Line Items]                                
Percentage of stock that may be redeemed in a given calander year             10.00%                  
Outside Director Stock Compensation Plan [Member]                                
Schedule of Capitalization [Line Items]                                
Issuance of Common Stock                 $ 12,700              
Common stock granted and issued under plan             3,444 4,074 3,521              
Maximum number of shares authorized for grant             100,000                  
Shares remain available for future awards             49,125                  
Preferred Stock, Shares Authorized             120,000 120,000                
Preferred Stock, Shares Outstanding             21,000 21,000                
Dividend Reinvestment and Common Stock Purchase Plan [Member]                                
Schedule of Capitalization [Line Items]                                
Issuance of Common Stock             $ 3,800                  
Percentage of discount purchase of common stock in investment plan             3.00%                  
Number of shares offering for discount             200,000                  
Dividend Reinvestment and Common Stock Purchase Plan [Member] | Subsequent Event [Member]                                
Schedule of Capitalization [Line Items]                                
Number of shares offering for discount 44,323