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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2015 and 2014 are as follows:
|  | Wireless Test |  |  | Industrial Automation |  |  | System Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 361,792 |  |  | $ | — |  |  | $ | 148,183 |  |  | $ | 260,540 |  |  | $ | 770,515 |
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | (148,183 | ) |  |  | (260,540 | ) |  |  | (408,723 | )
ZTEC adjustment |  |  | 27 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 27 |
AIT acquisition |  |  | — |  |  |  | — |  |  |  | 10,516 |  |  |  | — |  |  |  | 10,516 |
Balance at December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 361,819 |  |  |  | — |  |  |  | 158,699 |  |  |  | 260,540 |  |  |  | 781,058 |
Accumulated impairment losses |  |  | (98,897 | ) |  |  | — |  |  |  | (148,183 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
Universal Robots acquisition |  |  | — |  |  |  | 221,128 |  |  |  | — |  |  |  | — |  |  |  | 221,128 |
Foreign currency translation adjustment |  |  | — |  |  |  | (6,153 | ) |  |  | — |  |  |  | — |  |  |  | (6,153 | )
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 |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets:
|  | 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 |
|  | 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 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 assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2016 |  | $ | 79,874 |
2017 |  |  | 71,133 |
2018 |  |  | 44,464 |
2019 |  |  | 23,611 |
2020 |  |  | 9,990 |
Thereafter |  |  | 10,759 |

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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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