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Capitalization (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2017
Feb. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2015
Schedule of Capitalization [Line Items]            
Shares authorized     40,000,000 40,000,000    
Authorized shares under plan     300,000      
Issuance of shares under the DRP     $ 1,234 $ 1,453 $ 1,462  
Additional Shares Authorized By SEC To Be Issued           700,000
Maximum number of shares authorized for grant     50,000      
Preferred Stock, Shares Authorized     126,000 126,000    
Preferred Stock, Shares Outstanding     24,000 24,000    
Amount drawn     $ 11,523 $ 8,585 7,000  
Long-term debt     147,852 142,489    
Deobligated principal payments     476 $ 466  
Other long term debt     52,500 59,700    
Customer advances     $ 21,423 $ 20,846    
All Long-term Debt [Member]            
Schedule of Capitalization [Line Items]            
Weighted average interest rate     3.77% 3.88%    
Convertible Preferred Stock $7.00 Series [Member]            
Schedule of Capitalization [Line Items]            
Shares issued upon conversion     12      
Percentage of stock that may be redeemed in a given calander year     10.00%      
Convertible Preferred Stock $8.00 Series [Member]            
Schedule of Capitalization [Line Items]            
Shares issued upon conversion     13.714      
Outside Director Stock Compensation Plan [Member]            
Schedule of Capitalization [Line Items]            
Authorized shares under plan     64,168      
Common stock granted and issued under plan     3,976 3,976 4,795  
Maximum number of shares authorized for grant     100,000      
Dividend Reinvestment and Common Stock Purchase Plan [Member]            
Schedule of Capitalization [Line Items]            
Issuance of Common Stock     $ 1,200 $ 1,500 $ 1,500  
Shares authorized     3,000,000      
Dividend Reinvestment & Common Stock Purchase Plan, cumulative shares     2,400      
New Jersey Infrastructure Bank [Member]            
Schedule of Capitalization [Line Items]            
Maximum borrowing capacity, construction loan     $ 9,500      
Percentage of principal with stated interest rate     75.00%      
Percentage of principal with market interest rate     25.00%      
Amount drawn     $ 3,900      
Long-term debt     $ 3,800      
Interest rate     0.00%      
Deobligated principal payments     $ 500      
New Jersey Infrastructure Bank [Member] | Series XX [Member]            
Schedule of Capitalization [Line Items]            
Maximum borrowing capacity, construction loan $ 11,300          
Percentage of principal with bond interest rate 0.00%          
New Jersey Infrastructure Bank [Member] | Series YY [Member]            
Schedule of Capitalization [Line Items]            
Maximum borrowing capacity, construction loan $ 3,900          
New Jersey Infrastructure Bank [Member]            
Schedule of Capitalization [Line Items]            
Amount drawn     $ 14,200      
Construction Loan [Member]            
Schedule of Capitalization [Line Items]            
Interest rate     0.00%      
Tidewater [Member]            
Schedule of Capitalization [Line Items]            
Loan amount   $ 1,200     11,000  
Amount drawn   $ 1,100     $ 15,000  
Interest rate   2.00%        
Maturity date   Feb. 01, 2036     Apr. 30, 2040  
Loan amount initially set up as a market-based variable interest rate transaction         $ 4,000  
New Jersey Economic Development Authority [Member]            
Schedule of Capitalization [Line Items]            
Long-term debt     $ 55,400      
Delaware State Revolving Fund [Member]            
Schedule of Capitalization [Line Items]            
Long-term debt     $ 9,100      
Maximum [Member]            
Schedule of Capitalization [Line Items]            
Interest rate         4.47%  
Maximum [Member] | New Jersey Infrastructure Bank [Member] | Series YY [Member]            
Schedule of Capitalization [Line Items]            
Percentage of principal with bond interest rate 5.00%          
Minimum [Member]            
Schedule of Capitalization [Line Items]            
Interest rate         4.45%  
Minimum [Member] | New Jersey Infrastructure Bank [Member] | Series YY [Member]            
Schedule of Capitalization [Line Items]            
Percentage of principal with bond interest rate 3.00%