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Restructuring and Impairment (Summary of the Components of Restructuring, Integration and Impairment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
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 impairments 2,556  
Other costs 15  
Pre-tax restructuring, integration and impairment expense 3,439 $ 3,439
T & 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 607  
Asset impairments 2,556  
Other costs 15  
Pre-tax restructuring, integration and impairment expense 3,357  
Critical Power Solutions Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Lease termination and other facility costs 81  
Business integration expenses 1  
Pre-tax restructuring, integration and impairment expense $ 82