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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Apr. 03, 2016
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the three months ended April 3, 2016, were as follows:
|  | Wireless Test |  |  | Industrial Automation |  |  | System Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 361,819 |  |  | $ | 214,975 |  |  | $ | 158,699 |  |  | $ | 260,540 |  |  | $ | 996,033 |
Accumulated impairment losses |  |  | (98,897 | ) |  |  | — |  |  |  | (148,183 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
|  |  | 262,922 |  |  |  | 214,975 |  |  |  | 10,516 |  |  |  | — |  |  |  | 488,413 |
Foreign currency translation adjustment |  |  | — |  |  |  | 7,458 |  |  |  | — |  |  |  | — |  |  |  | 7,458 |
Balance at April 3, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 361,819 |  |  |  | 222,433 |  |  |  | 158,699 |  |  |  | 260,540 |  |  |  | 1,003,491 |
Accumulated impairment losses |  |  | (98,897 | ) |  |  | — |  |  |  | (148,183 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
|  | $ | 262,922 |  |  | $ | 222,433 |  |  | $ | 10,516 |  |  | $ | — |  |  | $ | 495,871 |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | April 3, 2016 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 333,947 |  |  | $ | 186,118 |  |  | $ | 147,829 |  |  |  | 6.0 years |
Customer relationships |  |  | 110,658 |  |  |  | 68,114 |  |  |  | 42,544 |  |  |  | 7.9 years |
Tradenames and trademarks |  |  | 53,169 |  |  |  | 20,468 |  |  |  | 32,701 |  |  |  | 9.5 years |
Non-compete agreement |  |  | 320 |  |  |  | 120 |  |  |  | 200 |  |  |  | 4.0 years |
Customer backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 498,264 |  |  | $ | 274,990 |  |  | $ | 223,274 |  |  |  | 6.8 years |
|  | December 31, 2015 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 379,778 |  |  | $ | 220,306 |  |  | $ | 159,472 |  |  |  | 6.0 years |
Customer relationships |  |  | 110,340 |  |  |  | 63,718 |  |  |  | 46,622 |  |  |  | 7.9 years |
Tradenames and trademarks |  |  | 52,396 |  |  |  | 18,879 |  |  |  | 33,517 |  |  |  | 9.5 years |
Non-compete agreement |  |  | 320 |  |  |  | 100 |  |  |  | 220 |  |  |  | 4.0 years |
Customer backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 543,004 |  |  | $ | 303,173 |  |  | $ | 239,831 |  |  |  | 6.7 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) |
2016 (remainder) |  | $ | 60,547 |
2017 |  |  | 71,899 |
2018 |  |  | 45,160 |
2019 |  |  | 24,260 |
2020 |  |  | 10,304 |
Thereafter |  |  | 11,104 |

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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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