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Capitalization (Narrative) (Details) (USD $) | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Oct. 31, 2014 Tidewater [Member] | May 31, 2014 First Mortgage Bonds - Series VV [Member] | Sep. 30, 2014 First Mortgage Bonds - Series VV [Member] | May 31, 2014 First Mortgage Bonds - Series WW [Member] | Sep. 30, 2014 First Mortgage Bonds - Series WW [Member] | May 31, 2014 New Jersey Environmental Infrastructure Trust [Member] | Sep. 30, 2014 Convertible Preferred Stock $7.00 Series [Member]
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of shares under the DRP | $ 1,100,000 | $ 1,300,000 |  |  |  |  |  |  |  |
Issuance of shares under the DRP,shares | 54,627 | 63,649 |  |  |  |  |  |  |  |
Proceeds from long-term debt borrowing | 4,398,000 | 3,987,000 |  |  |  |  |  |  | 3,800,000 |
Issuance of series bonds |  |  |  |  | 2,800,000 |  | 900,000 |  |  |
Interest rate |  |  |  |  |  | 0.00% |  |  |  |
Interest rate - minimum |  |  |  |  |  |  |  | 3.00% |  |
Interest rate - maximum |  |  |  |  |  |  |  | 5.00% |  |
Due date of debt |  |  |  |  |  | Aug. 01, 2033 |  | Aug. 01, 2033 |  |
Number of shares converted |  |  |  |  |  |  |  |  |  | 4,293
Value of shares converted |  |  |  |  |  |  |  |  |  | 500,000
Number of shares of common stock issued upon conversion | 51,516 |  |  |  |  |  |  |  |  |
Loan amount |  |  |  | 15,000,000 |  |  |  |  |  |
Other long term debt | 43,700,000 |  | 45,000,000 |  |  |  |  |  |  |
Customer advances | $ 21,336,000 |  | $ 21,837,000 |  |  |  |  |  |  |

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