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Intangible Assets | 3 Months Ended
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Mar. 30, 2014
Intangible Assets | K. Intangible Assets Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | March 30, 2014 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 362,126 |  |  | $ | 206,551 |  |  | $ | 155,575 |  |  |  | 6.3 years |
Customer relationships |  |  | 146,276 |  |  |  | 86,333 |  |  |  | 59,943 |  |  |  | 8.0 years |
Trade names and trademarks |  |  | 33,834 |  |  |  | 15,332 |  |  |  | 18,502 |  |  |  | 9.0 years |
Customer backlog |  |  | 1,000 |  |  |  | 1,000 |  |  |  | — |  |  |  | 0.4 years |
Total intangible assets |  | $ | 543,236 |  |  | $ | 309,216 |  |  | $ | 234,020 |  |  |  | 7.0 years |
|  | December 31, 2013 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 362,126 |  |  | $ | 193,756 |  |  | $ | 168,370 |  |  |  | 6.3 years |
Customer relationships |  |  | 146,276 |  |  |  | 81,742 |  |  |  | 64,534 |  |  |  | 8.0 years |
Trade names and trademarks |  |  | 33,834 |  |  |  | 14,447 |  |  |  | 19,387 |  |  |  | 9.0 years |
Customer backlog |  |  | 1,000 |  |  |  | 1,000 |  |  |  | — |  |  |  | 0.4 years |
Total intangible assets |  | $ | 543,236 |  |  | $ | 290,945 |  |  | $ | 252,291 |  |  |  | 7.0 years |
Aggregate intangible asset amortization expense was $18.3 million and $18.0 million, respectively, for the three months ended March 30, 2014 and March 31, 2013. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2014 (remainder) |  | $ | 51,870 |
2015 |  |  | 53,391 |
2016 |  |  | 53,391 |
2017 |  |  | 47,232 |
2018 |  |  | 22,691 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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