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ACQUISITIONS (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Aug. 01, 2015
Jan. 16, 2015
Business Acquisition [Line Items]      
Net assets acquired $ 3,056    
Harmonics Holdings Incorporated [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Name of Acquired Entity Harmonics Holdings Inc.    
Business acquisition, effective date of acquisition Jan. 16, 2015    
Business combination location within acquiree's segment T&D Solutions    
Business combination primary form of consideration Seller note/debt forgiveness    
Net assets acquired     $ 1,043
Pacific Power Systems Integration Incorporated [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Name of Acquired Entity Pacific Power Systems Integration, Inc.    
Business acquisition, effective date of acquisition Aug. 01, 2015    
Business combination location within acquiree's segment T&D Solutions    
Business combination primary form of consideration Cash    
Net assets acquired   $ 2,013