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Capitalization (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
May 31, 2018
Nov. 30, 2017
Feb. 29, 2016
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Aug. 31, 2018
Apr. 30, 2018
Mar. 31, 2018
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         $ 1,150 $ 1,234 $ 1,453        
Additional Shares Authorized By SEC To Be Issued         600,000            
Maximum number of shares authorized for grant         50,000            
Preferred Stock, Shares Authorized         126,000 126,000          
Preferred Stock, Shares Outstanding         23,000 23,000          
Amount drawn         $ 22,076 $ 11,523 8,585        
Long-term debt         162,904 147,852          
Deobligated principal payments         $ 476        
Other long term debt         61,500 52,500          
Customer advances         $ 22,572 $ 21,423          
All Long-term Debt [Member]                      
Schedule of Capitalization [Line Items]                      
Weighted average interest rate         3.30% 3.77%          
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         60,164            
Common stock granted and issued under plan         4,004 3,976 3,976        
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 $ 1,200 $ 1,500        
Shares authorized         3,000,000            
Maximum [Member]                      
Schedule of Capitalization [Line Items]                      
Common stock granted and issued under plan         200,000            
Percentage of offering shares on discount to participants         5.00%            
New Jersey Infrastructure Bank [Member]                      
Schedule of Capitalization [Line Items]                      
Maximum borrowing amount                     $ 14,000
Maximum borrowing capacity, construction loan         $ 9,500     $ 8,700 $ 43,500 $ 55,000  
Percentage of principal with stated interest rate         75.00%            
Percentage of principal with market interest rate         25.00%            
Amount drawn         $ 9,300            
Long-term debt         $ 62,500            
Interest rate         0.00%            
Deobligated principal payments         $ 500            
New Jersey Infrastructure Bank [Member] | Minimum [Member] | Subsequent Event [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from issuance of first mortgage bond       $ 25,000              
New Jersey Infrastructure Bank [Member] | Maximum [Member] | Subsequent Event [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from issuance of first mortgage bond       $ 75,000              
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] | Series YY [Member] | Minimum [Member]                      
Schedule of Capitalization [Line Items]                      
Percentage of principal with bond interest rate   3.00%                  
New Jersey Infrastructure Bank [Member] | Series YY [Member] | Maximum [Member]                      
Schedule of Capitalization [Line Items]                      
Percentage of principal with bond interest rate   5.00%                  
New Jersey Infrastructure Bank [Member]                      
Schedule of Capitalization [Line Items]                      
Amount drawn         $ 15,100            
Maturity date         Aug. 01, 2047            
Construction Loan [Member]                      
Schedule of Capitalization [Line Items]                      
Interest rate         0.00%            
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            
New Jersey Infrastructure Bank [Member]                      
Schedule of Capitalization [Line Items]                      
Amount drawn         $ 10,500            
New Jersey Infrastructure Bank [Member]                      
Schedule of Capitalization [Line Items]                      
Amount drawn         6,100            
Tidewater [Member]                      
Schedule of Capitalization [Line Items]                      
Loan amount     $ 1,200                
Amount drawn     $ 1,100                
Interest rate     2.00%                
Maturity date     Feb. 01, 2036                
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]                      
Maximum borrowing amount               $ 10,000     $ 900
Long-term debt         8,400            
Series 2018A [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from issuance of first mortgage bond $ 7,100                    
Maturity date Aug. 01, 2047                    
Series 2018A [Member] | Minimum [Member]                      
Schedule of Capitalization [Line Items]                      
Interest rate 3.00%                    
Series 2018A [Member] | Maximum [Member]                      
Schedule of Capitalization [Line Items]                      
Interest rate 5.00%                    
Series 2018B [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from issuance of first mortgage bond $ 2,400                    
Maturity date Aug. 01, 2047                    
Amortizing Secured Notes [Member]                      
Schedule of Capitalization [Line Items]                      
Long-term debt         $ 36,600