Summary of Significant Accounting Policies In Text Linking (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate	Dec. 31, 2010 Rate
Summary of Significant Accounting Policies [Abstract]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	0.00%	0.00%	0.00%
Total Number of Customers Served	121,791
Total Towns Served	76
Adjustment Recorded to the Prior Year Unfunded Future Income Taxes		$ 22,000,000
Adjustment to the Prior Year Unrecovered Income Taxes - Regulatory Asset		22,000,000
Goodwill	$ 31,685,000	$ 3,608,000