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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