Organization, Basis of Presentation and Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
In service	$ 40,122,000	$ 30,276,000
Less - Accumulated provision for depreciation	(11,839,000)	(11,283,000)
Net plant in service	28,283,000	18,993,000
Unregulated Operation
Property, Plant and Equipment
In service	15,472,000	12,104,000
Less - Accumulated provision for depreciation	(4,424,000)	(4,255,000)
Net plant in service	11,048,000	7,849,000
Regulated Operation [Member]
Property, Plant and Equipment
In service	24,650,000	18,172,000
Less - Accumulated provision for depreciation	(7,415,000)	(7,028,000)
Net plant in service	$ 17,235,000	$ 11,144,000