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Restructuring and Business Realignment (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Charge to expense $ 1,812 $ 2,617 $ 1,029
Cost of Sales [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 426 437 172
Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 1,385 1,080 528
Design and Development [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 1 1,100 329
Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense [1] 1,223 1,180 317
Electronics [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 20 59 183
PST Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense [2] $ 589 $ 1,437 403
Corporate [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense [3]     309
Corporate [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense     $ 309
[1] 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.
[2] 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.
[3] Severance costs for the year ended December 31, 2015 related to SG&A were $309.