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Restructuring and Impairment (Summary of the Components of Restructuring, Integration and Impairment Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Employee severance and related costs $ 564  
Lease termination and other facility costs 248  
Business integration expenses 1,570  
Asset impairments 2,792  
Other costs 403  
Pre-tax restructuring, integration and impairment expense 5,577 $ 1,402
T & D Solutions Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Employee severance and related costs 564  
Lease termination and other facility costs 168  
Business integration expenses 1,565  
Asset impairments 2,792  
Other costs 403  
Pre-tax restructuring, integration and impairment expense 5,492  
Critical Power Solutions Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Employee severance and related costs 0  
Lease termination and other facility costs 80  
Business integration expenses 5  
Asset impairments 0  
Other costs 0  
Pre-tax restructuring, integration and impairment expense $ 85