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Acquisitions (Summary of Acquisitions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 01, 2015
Jan. 16, 2015
Dec. 02, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchase Price Allocation            
Goodwill       $ 10,068 $ 9,606 $ 7,998
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      
Business combination, separately recognized transactions, assets recognized     1,958      
Purchase Price Allocation            
Current assets     3,721      
Property, plant and equipment     410      
Identifiable intangible assets     5,147      
Goodwill     2,969      
Total assets acquired     12,247      
Current liabilities     (7,131)      
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        
Business combination, separately recognized transactions, assets recognized   1,043        
Purchase Price Allocation            
Current assets   21        
Property, plant and equipment   4        
Identifiable intangible assets   995        
Goodwill   23        
Total assets acquired   1,043        
Current liabilities   0        
Net assets acquired   1,043   $ 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   $ 341        
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          
Business combination, separately recognized transactions, assets recognized 2,013          
Purchase Price Allocation            
Current assets 18          
Property, plant and equipment 147          
Identifiable intangible assets 1,500          
Goodwill 348          
Total assets acquired 2,013          
Current liabilities 0          
Net assets acquired 2,013     $ 2,013    
Pacific Power Systems Integration Inc. [Member] | Forgiveness Trade Payables and Indebtedness to Purchaser [Member]            
Purchase Price            
Business combination, separately recognized transactions, assets recognized 0          
Pacific Power Systems Integration Inc. [Member] | Deferred Purchase Price Due To Seller [Member]            
Purchase Price            
Business combination, separately recognized transactions, assets recognized $ 0