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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jul. 05, 2015
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amounts of goodwill by segment are as follows:
|  | Wireless Test |  |  | Industrial Automation |  |  | System Test Group |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2014 |  | $ | 262,922 |  |  | $ | — |  |  | $ | 10,516 |  |  | $ | 273,438 |
Goodwill acquired during period |  |  | — |  |  |  | 226,501 |  |  |  | — |  |  |  | 226,501 |
Foreign currency translation adjustment |  |  | — |  |  |  | (4,505 | ) |  |  | — |  |  |  | (4,505 | )
Balance at July 5, 2015 |  | $ | 262,922 |  |  | $ | 221,996 |  |  | $ | 10,516 |  |  | $ | 495,434 |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | July 5, 2015 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 432,656 |  |  | $ | 244,514 |  |  | $ | 188,142 |  |  |  | 5.9 years |
Customer relationships |  |  | 155,831 |  |  |  | 100,500 |  |  |  | 55,331 |  |  |  | 7.5 years |
Tradenames and trademarks |  |  | 51,668 |  |  |  | 16,275 |  |  |  | 35,393 |  |  |  | 5.3 years |
Non-compete agreement |  |  | 320 |  |  |  | 60 |  |  |  | 260 |  |  |  | 4.0 years |
Customer order backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 640,645 |  |  | $ | 361,519 |  |  | $ | 279,126 |  |  |  | 6.6 years |
|  | December 31, 2014 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 345,513 |  |  | $ | 224,059 |  |  | $ | 121,454 |  |  |  | 6.2 years |
Customer relationships |  |  | 146,635 |  |  |  | 93,998 |  |  |  | 52,637 |  |  |  | 7.7 years |
Tradenames and trademarks |  |  | 30,414 |  |  |  | 14,205 |  |  |  | 16,209 |  |  |  | 9.0 years |
Non-compete agreement |  |  | 320 |  |  |  | 20 |  |  |  | 300 |  |  |  | 4.0 years |
Customer order backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 523,052 |  |  | $ | 332,452 |  |  | $ | 190,600 |  |  |  | 6.8 years |
Schedule of Estimated Intangible Asset Amortization Expense | Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2015 (remainder) |  | $ | 39,932 |
2016 |  |  | 79,863 |
2017 |  |  | 71,269 |
2018 |  |  | 44,440 |
2019 |  |  | 23,591 |
Thereafter |  |  | 20,031 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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