REGULATORY ASSETS & REGULATORY LIABILITIES 2 (Details) (USD $)	1 Months Ended
	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011
Regulatory Liabilities [Line Items]
Total regulatory liabilities		$ 56,517,000	$ 48,311,000
Excess Plant Removal Costs [Member]
Regulatory Liabilities [Line Items]
Total regulatory liabilities		45,593,000	47,230,000
Annual amortization reflected in depreciation expense	1,200,000
Deferred Revenues - Net [Member]
Regulatory Liabilities [Line Items]
Total regulatory liabilities		10,924,000	0
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Total regulatory liabilities		$ 0	$ 1,081,000