REGULATORY ASSETS AND LIABILITIES REGULATORY ASSETS AND LIABILITIES 2 (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 52,219	$ 56,517
Excess Plant Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	41,128	45,593
Deferred Revenues - Net [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	8,352	10,924
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 2,739	$ 0