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Equity and Stock Based Compensation Plans (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 28, 2013 | Sep. 29, 2012 | Sep. 28, 2013 | Sep. 29, 2012
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | $ 2,702 | $ 1,482 | $ 5,912 | $ 4,535
Cost of products [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 55 | 50 | 153 | 128
Cost of service [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 74 | 62 | 204 | 195
Research and development [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 412 | 289 | 1,092 | 952
Selling [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 476 | 451 | 1,418 | 1,374
General and administrative [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 789 | 630 | 2,149 | 1,886
Restructuring [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | $ 896 | $ 0 | $ 896 | $ 0

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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