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Acquisitions (Summary of Acquisitions) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 16, 2015
Dec. 02, 2014
Jun. 30, 2015
Dec. 31, 2014
Purchase Price Allocation        
Goodwill     $ 10,624 $ 9,606
Net assets acquired     $ 3,160  
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   2,719    
Total assets acquired   11,997    
Current liabilities   (6,881)    
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