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Acquisitions (Summary of Acquisitions) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Aug. 01, 2015
Jan. 16, 2015
Dec. 02, 2014
Sep. 30, 2015
Dec. 31, 2014
Purchase Price Allocation          
Goodwill       $ 12,646 $ 9,606
Net assets acquired       $ 5,173  
Titan Energy Worldwide Inc. [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Name of Acquired Entity       Titan Energy Worldwide, Inc.  
Business acquisition, effective date of acquisition       Dec. 02, 2014  
Business combination location within acquiree's segment       Critical Power  
Business combination primary form of consideration       Cash/stock  
Purchase Price          
Cash consideration     $ 953    
Common stock consideration     1,005    
Purchase Price Allocation          
Current assets     3,721    
Property, plant and equipment     410    
Identifiable intangible assets     5,147    
Goodwill     2,893    
Total assets acquired     12,171    
Current liabilities     (7,055)    
Notes payable     (3,158)    
Net assets acquired     1,958 $ 1,958  
Cash and cash equivalents     $ 100    
Harmonics Holdings Inc. [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  
Purchase Price          
Cash consideration   $ 93      
Purchase Price Allocation          
Current assets   21      
Property, plant and equipment   4      
Goodwill   1,177      
Total assets acquired   1,202      
Net assets acquired   1,202   $ 1,202  
Harmonics Holdings Inc. [Member] | Forgiveness Trade Payables and Indebtedness to Purchaser [Member]          
Purchase Price          
Business combination, separately recognized transactions, assets recognized   609      
Harmonics Holdings Inc. [Member] | Deferred Purchase Price Due To Seller [Member]          
Purchase Price          
Business combination, separately recognized transactions, assets recognized   $ 500      
Pacific Power Systems Integration Inc. [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  
Purchase Price          
Cash consideration $ 2,013        
Purchase Price Allocation          
Current assets 18        
Property, plant and equipment 147        
Goodwill 1,848        
Total assets acquired 2,013        
Net assets acquired $ 2,013     $ 2,013