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Acquisitions (Details) In Thousands, unless otherwise specified | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($) | Dec. 28, 2013 USD ($) | Sep. 27, 2014 Radiance USD ($) | Mar. 29, 2014 Radiance USD ($) | Sep. 27, 2014 Radiance USD ($) | Mar. 29, 2014 Radiance EUR (€) | Sep. 27, 2014 Prior Acquisition USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid for acquired businesses | $ 3,648 | $ 15,332 |  | $ 40 | $ 2,627 |  |  | $ 981
Cash acquired |  |  |  |  | 674 |  |  |
Debt assumed |  |  |  |  | 53 |  |  |
Business acquisition, contingent consideration, potential cash payment |  |  |  | 1,275 |  | 1,275 | 1,000 |
Fair Value of Contingent consideration | 1,175 |  |  |  |  |  |  |
Identifiable intangible assets acquired |  |  |  | 1,800 |  | 1,800 |  |
Weighted average useful life of acquired intangible assets |  |  |  |  |  | 12 years |  |
Goodwill | $ 129,880 |  | $ 131,915 | $ 1,459 |  | $ 1,459 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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