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OTHER INVESTMENTS EnerTech Capital Partners (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 40 Months Ended |
--- | --- | --- | ---
Aug. 31, 2007 | Nov. 30, 2010 | Dec. 01, 2010
Schedule of Cost-method Investments [Line Items] |  |  |
Investment commitment, maximum amount | $ 5,000 |  |
Investment commitment, maximum possible period to invest | 10 years |  |
Amount funded in EnerTech |  | 3,050 |
Cost method investment, Ownership Percentage |  | 5.70% |
Cost method investment, proceeds from sale |  |  | $ 1,116

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