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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) site | Sep. 30, 2015 USD ($)
Site Contingency [Line Items] |  |  |
Number of MGP sites | site |  | 5 |
Recovery of expenditures, including carrying costs, rolling period approved by the BPU |  | 7 years |
Regulatory assets |  | $ 423,332 | $ 410,155
Minimum [Member] |  |  |
Site Contingency [Line Items] |  |  |
Litigation settlement, gross |  | 150,900 |
Maximum [Member] |  |  |
Site Contingency [Line Items] |  |  |
Litigation settlement, gross |  | 242,100 |
Environmental Remediation Costs Expended, Net of Recoveries [Member] |  |  |
Site Contingency [Line Items] |  |  |
Regulatory assets |  | 17,963 | 18,886
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |  |
Site Contingency [Line Items] |  |  |
Regulatory assets |  | $ 180,400 | $ 180,400
SBC [Member] | September 2014 SBC Filing [Member] |  |  |
Site Contingency [Line Items] |  |  |
Requested rate, amount | $ 8,500 |  |

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