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Business Realignment and Restructuring (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 355 $ (13) $ 1,517 $ 729
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges (27) 16   42
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 392 (29) 1,517 559
Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges (10)     128
Control Devices [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges (37) 32 512 160
Control Devices [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs (27)      
Control Devices [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   32 512 32
Control Devices [Member] | Design and Development [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs       128
Control Devices [Member] | Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs (10)      
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges   (80)   215
Electronics [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   (80)   215
PST Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges   35   354
PST Segment [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   16   42
PST Segment [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   $ 19   $ 312
Unallocated Corporate [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 392   1,005  
Unallocated Corporate [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 392   $ 1,005