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Goodwill and Intangible Assets (Finite-lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 28, 2013
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 31,240 | $ 31,927
Accumulated amortization | (25,985) | (24,063)
Net carrying amount | 5,255 | 7,864
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 17,471 | 18,095
Accumulated amortization | (12,647) | (11,032)
Net carrying amount | 4,824 | 7,063
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,510 | 9,573
Accumulated amortization | (9,444) | (9,263)
Net carrying amount | 66 | 310
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,776) | (1,700)
Net carrying amount | 151 | 227
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,038) | (1,988)
Net carrying amount | 214 | 264
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (80)
Net carrying amount | $ 0 | $ 0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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