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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
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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] |  |  |  |
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.

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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