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Goodwill (Details) (USD $) | 9 Months Ended
--- | ---
Sep. 27, 2014 item | Sep. 28, 2013
Goodwill |  |
Number of reporting units | 1 |
Goodwill impairment | $ 0 | $ 0
Changes in the carrying amount of goodwill |  |
Balance at the beginning of the period, gross | 153,466,000 | 142,658,000
Goodwill adjustments related to acquisitions | 1,809,000 | 5,358,000
Goodwill adjustments related to NeuCo |  | (63,000)
Effect of foreign currency translation | (257,000) | (34,000)
Balance at the end of the period, gross | 155,018,000 | 147,919,000
Balance at the beginning of the period, Accumulated impairment losses | (71,893,000) | (71,893,000)
Balance at the end of the period, Accumulated impairment losses | (71,893,000) | (71,893,000)
Balance at the beginning of the period, net | 81,573,000 | 70,765,000
Balance at the end of the period, net | $ 83,125,000 | $ 76,026,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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