REGULATORY ASSETS AND LIABILITIES REGULATORY ASSETS AND LIABILITIES 2 (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 48,158	$ 60,949
Excess Plant Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	39,647	40,029
Deferred Revenues - Net [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	19,067
Conservation Incentive Program Payable [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	6,193	0
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 2,318	$ 1,853