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Restructuring and Business Realignment (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 1,812 $ 2,617 $ 1,029  
PST Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [1] 589 1,437 403  
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve   273 458 $ 733
Restructuring charges [2] 1,223 1,180 317  
Restructuring expense 20 59 183  
Control Devices [Member]        
Restructuring Cost and Reserve [Line Items]        
Business realignment charges 0 0 0  
Restructuring expense   0 0 $ 0
Corporate [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [3]     309  
Facility Closing [Member] | Other Liabilities [Member] | Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve   273    
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 1,385 1,080 528  
Selling, General and Administrative Expenses [Member] | Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 20 59 183  
Selling, General and Administrative Expenses [Member] | Corporate [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     309  
Cost of Sales [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 426 $ 437 $ 172  
[1] Severance costs for the year ended December 31, 2017 related to COGS, SG&A and D&D were $370, $218 and $1, respectively. Severance costs for the year ended December 31, 2016 related to COGS, SG&A and D&D were $437, $884 and $116, respectively. Severance costs for the year ended December 31, 2015 related to COGS, SG&A and D&D were $172, $117 and $114, respectively.
[2] Severance costs for the year ended December 31, 2017 related to COGS and SG&A were $56 and $1,167, respectively. Severance costs for the year ended December 31, 2016 related to SG&A and design and development (“D&D”) were $196 and $984, respectively. Severance costs for the year ended December 31, 2015 related to SG&A and D&D were $102 and $215, respectively.
[3] Severance costs for the year ended December 31, 2015 related to SG&A were $309.