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Equity and Stock Based Compensation Plans (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | $ 1,751 | $ 1,593 | $ 3,208 | $ 3,054
Cost of products [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 53 | 20 | 98 | 77
Cost of service [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 71 | 75 | 130 | 133
Research and development [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 362 | 347 | 679 | 666
Selling [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | 501 | 481 | 941 | 922
General and administrative [Member] |  |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |  |
Total stock-based compensation expense | $ 764 | $ 670 | $ 1,360 | $ 1,256

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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6793087&loc=d3e301413-122809 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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