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Business Realignment (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 520 $ 323 $ 742 $ 494
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 26 304 26 394
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 366 19 588 100
Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 128   128  
Control Devices [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 128   128  
Control Devices [Member] | Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 128   128  
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 295 56 295 56
Electronics [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs   56   56
Electronics [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs     295  
PST Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges [1] 97 267 319 438
PST Segment [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 26 248 26 338
PST Segment [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 71 $ 19 $ 293 $ 100
[1] Severance costs for the three and six months ended June 30, 2018 related to SG&A were $295. Severance costs for the three and six months ended June 30, 2017 related to COGS were $56. Severance costs for the three and six months ended June 30, 2018 related to SG&A were $71 and $293, respectively. Severance costs for the three and six months ended June 30, 2018 related to COGS were $26. Severance costs for the three months ended June 30, 2017 related to COGS and SG&A were $248 and $19, respectively. Severance costs for the six months ended June 30, 2017 related to COGS and SG&A were $338 and $100, respectively.