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RESTRUCTURING AND INTEGRATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]        
Employee severance and related costs   $ 36    
Lease termination and other facility costs   224    
Business integration expenses   608    
Asset write-down   2,556    
Other costs   15    
Pre-tax restructuring and integration expense $ 19 3,439 $ 199 $ 3,439
T And D Solutions Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Employee severance and related costs   36    
Lease termination and other facility costs   143    
Business integration expenses   608    
Asset write-down   2,556    
Other costs   15    
Pre-tax restructuring and integration expense   3,358 $ 199  
Critical Power Solutions Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Employee severance and related costs      
Lease termination and other facility costs   81    
Business integration expenses      
Asset write-down      
Other costs      
Pre-tax restructuring and integration expense   $ 81