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Restructuring and Business Realignment (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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