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ACQUISITIONS GridSense (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 15, 2012
Dec. 31, 2011
May 20, 2010
years
May 12, 2010
Business Acquisition [Line Items]        
Business Acquisition, Purchase Price Allocation, Liabilities Assumed     $ 352  
Percentage of outstanding shares from total outstanding shares, acquired in business acquisition.       70.00%
Business Acquisition, Contingent Consideration, Potential Cash Payment   0 50  
Business Acquisition, Cost of Acquired Entity, Purchase Price     (402) (4,406)
Business Acquisition, Purchase Price Allocation, Gain on Step-Up of Investment       (1,327)
GridSense technologies finite intangible asset acquired       1,793
GridSense technologies finite intangible asset acquired useful life       11 years
Finite-Lived Customer Relationships, Gross 3,236     253
Weighted average estimated useful life in years of the acquired customer relationships       10 years
Finite-Lived Trade Names, Gross       187
GridSense trade name acquired useful life       15 years
Finite-Lived Noncompete Agreements, Gross 26     81
The amount of finite-lived intangible assets acquired in business combination assigned to the acquiree intellectual property     (222)  
Estimated useful life in years of the acquired intellectual property.     5  
The amount of finite-lived intangible assets acquired in business combination assigned to the acquiree non-compete agreements     $ 100  
Estimated useful life in years of the acquired non-compete agreements     3 years 3 years