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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2013 | Dec. 29, 2012
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 31,447 | $ 31,497
Accumulated amortization | (22,221) | (20,517)
Net carrying amount | 9,226 | 10,980
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 17,659 | 17,700
Accumulated amortization | (9,558) | (8,277)
Net carrying amount | 8,101 | 9,423
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,529 | 9,538
Accumulated amortization | (8,978) | (8,643)
Net carrying amount | 551 | 895
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,650) | (1,599)
Net carrying amount | 277 | 328
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (1,955) | (1,922)
Net carrying amount | 297 | 330
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (76)
Net carrying amount | $ 0 | $ 4

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