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Energy And Related Sales, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Energy and related sales net
Energy sales	$ 5,284	$ 10,992	$ 14,296
Costs to produce	(4,187)	(9,319)	(10,403)
Net energy sales	1,097	1,673	3,893
Renewable energy credits	5,903	7,671	6,760
Total energy and related sales, net	$ 7,000	$ 9,344	$ 10,653

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Revenue from sales of excess internally generated power, net of costs to produce, and revenue from sales of renewable energy credits.

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Sales revenue energy services net.

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Cost incurred in providing energy services during the reporting period.

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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Revenue earned during the period from alternative energy sources (for example, ethanol, biomass, solar, geothermal, and wind power).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Revenue derived from energy-related services such as supplying various forms of energy from the operation of on-site facilities or cogeneration plants and procurement services provided to energy purchasers.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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-Subparagraph (SX 210.5-03.1)

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-Name Regulation S-X (SX)

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