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Restructuring and Business Realignment (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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] |  |  |  |
Restructuring Reserve, Beginning Balance |  | 273 | 458 | 733
Charge to expense | [1] | 1,223 | 1,180 | 317
Charge to expense |  | 20 | 59 | 183
Foreign currency translation effect |  | 3 | (69) | 3
Cash payments |  | (296) | (175) | (461)
Restructuring Reserve, Ending Balance |  |  | 273 | 458
Electronics [Member] | Cost of Sales [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  | 56 |  |
Electronics [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Charge to expense |  | 20 | 59 | 183
Severance costs |  | 1,167 | 196 | 102
Electronics [Member] | Design and Development [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  |  | 984 | 215
PST Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Charge to expense | [2] | 589 | 1,437 | 403
PST Segment [Member] | Cost of Sales [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  | 370 | 437 | 172
PST Segment [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  | 218 | 884 | 117
PST Segment [Member] | Design and Development [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  | $ 1 | $ 116 | 114
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.

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