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Business Realignment and Corporate Headquarter Relocation (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 53 $ 211 $ 547 $ 2,422
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 17 20    
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 35 191    
Design and Development [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 1      
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges [1] 16   72 1,180
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     16 196
Electronics [Member] | Design and Development [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs       984
PST Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges [2] 37 211 475 1,242
PST Segment [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 17 20 355 307
PST Segment [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 19 $ 191 119 819
PST Segment [Member] | Design and Development [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 1   $ 1 $ 116
[1] 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. Severance costs for the nine months ended September 30, 2016 related to SG&A and design and development (“D&D”) were $196 and $984, respectively.
[2] 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 three months ended September 30, 2016 related to COGS and SG&A were $20 and $191, respectively.