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Capitalization (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Nov. 30, 2012 | Jun. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Series QQ RR SS | Dec. 31, 2012 Series QQ | Dec. 31, 2012 Series S - W | Jan. 31, 2013 Series DD | May 31, 2012 New Jersey State Revolving Fund | Dec. 31, 2010 New Jersey State Revolving Fund | May 31, 2012 OOMember | May 31, 2012 PPMember | Dec. 31, 2012 Delaware State Revolving Fund | Mar. 31, 2011 Delaware State Revolving Fund Tidewater | Mar. 31, 2011 Delaware State Revolving Fund Southern Shores | Dec. 31, 2012 New Jersey Economic Development Authority | Dec. 31, 2012 New Jersey Environmental Infrastructure Trust | Dec. 31, 2012 Nonredeemable Preferred Stock $7.00 Series | Dec. 31, 2012 Convertible Preferred Stock $7.00 Series | Dec. 31, 2012 Convertible Preferred Stock $8.00 Series | Dec. 31, 2012 Outside Director Stock Compensation Plan | Dec. 31, 2011 Outside Director Stock Compensation Plan | Dec. 31, 2010 Outside Director Stock Compensation Plan | Dec. 31, 2012 Dividend Reinvestment and Common Stock Purchase Plan
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock |  | $ 27,800 |  |  | $ 27,928 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering, price per share |  | $ 15.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock in a public offering, shares |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000
Authorized shares under plan |  |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,429 |  |  |
Dividend Reinvestment & Common Stock Purchase Plan, cumulative shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000
Common stock granted and issued under plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,768 | 3,833 | 1,416 |
Issuance of shares under the DRP |  |  | 1,587 | 1,504 | 1,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends in arrears |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased in the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93 |  |  |  |  |  |
Shares issued upon conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 13.714 |  |  |  |
Percentage of stock that may be redeemed in a given calander year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Repayment of first mortgage bonds | 57,500 |  |  |  |  |  |  | 51,500 | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from refinance of first mortgage bonds | 57,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  | 57,600 |  |  |  | 3,900 | 4,000 | 3,000 | 900 |  | 2,800 | 1,600 |  |  |  |  |  |  |  |  |
Premium on debt |  |  |  |  |  |  | 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  | 3.75% | 3.75% |  |  |  |  |  |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2031 | Aug. 01, 2031 |  | Jul. 01, 2031 | Nov. 30, 2030 |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 4.34% | 5.13% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, outstanding |  |  | 131,467 | 132,167 |  |  |  |  |  |  |  |  |  | 10,200 |  |  | 61,400 | 31,200 |  |  |  |  |  |  |
Deobligated principal payments |  |  | 255 | 560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long term debt |  |  | 47,700 | 49,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer advances |  |  | $ 21,990 | $ 21,944 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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