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Business Realignment (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) $ (13) $ 53 $ 729 $ 547
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) 16 17 42 411
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) (29) 35 559 135
Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit)   1 128 1
Control Devices [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) [1] 32   160  
Control Devices [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 32   32  
Control Devices [Member] | Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs     128  
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) [2] (80) 16 215 72
Electronics [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs       56
Electronics [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs (80) 16 215 16
PST Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment costs (benefit) [3] 35 37 354 475
PST Segment [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 16 17 42 355
PST Segment [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 19 19 $ 312 119
PST Segment [Member] | Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   $ 1   $ 1
[1] Severance costs for the nine months ended September 30, 2018 related to D&D were $128. Severance costs for the three and nine months ended September 30, 2018 related to SG&A were $32
[2] Severance costs (benefit) for the three and nine months ended September 30, 2018 related to SG&A were $(80) and $215, respectively. Severance costs for the three and nine months ended September 30, 2017 related to SG&A were $16. Severance costs for the nine months ended September 30, 2017 related to COGS were $56
[3] Severance costs for the three and nine months ended September 30, 2018 related to SG&A were $19 and $312, respectively. Severance costs for the three and nine months ended September 30, 2018 related to COGS were $16 and $42, respectively. Severance costs for the three months ended September 30, 2017 related to COGS, SG&A and D&D were $17, $19 and $1, respectively. Severance costs for the nine months ended September 30, 2017 related to COGS, SG&A and D&D were $355, $119 and $1, respectively