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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
Changes in Carrying Amount of Goodwill by Reporting Units | The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2014 and 2013 are as follows:
|  | Semiconductor Test |  |  | System Test |  |  | Wireless Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 260,540 |  |  | $ | 148,183 |  |  | $ | 349,272 |  |  | $ | 757,995 |
Accumulated impairment losses |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | — |  |  |  | (408,723 | )
|  |  | — |  |  |  | — |  |  |  | 349,272 |  |  |  | 349,272 |
ZTEC acquisition |  |  | — |  |  |  | — |  |  |  | 12,520 |  |  |  | 12,520 |
Balance at December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 260,540 |  |  |  | 148,183 |  |  |  | 361,792 |  |  |  | 770,515 |
Accumulated impairment losses |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | — |  |  |  | (408,723 | )
|  |  | — |  |  |  | — |  |  |  | 361,792 |  |  |  | 361,792 |
ZTEC adjustment |  |  | — |  |  |  | — |  |  |  | 27 |  |  |  | 27 |
AIT acquisition |  |  | — |  |  |  | 10,516 |  |  |  | — |  |  |  | 10,516 |
Balance at December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 260,540 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 781,058 |
Accumulated impairment losses |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (98,897 | ) |  |  | (507,620 | )
|  | $ | — |  |  | $ | 10,516 |  |  | $ | 262,922 |  |  | $ | 273,438 |
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, 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-competes |  |  | 320 |  |  |  | 20 |  |  |  | 300 |  |  |  | 4.0 years |
Customer backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | 0.0 years |
Total intangible assets |  | $ | 523,052 |  |  | $ | 332,452 |  |  | $ | 190,600 |  |  |  | 6.8 years |
|  | December 31, 2013 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 342,933 |  |  | $ | 174,563 |  |  | $ | 168,370 |  |  |  | 6.2 years |
Customer relationships |  |  | 141,497 |  |  |  | 76,963 |  |  |  | 64,534 |  |  |  | 8.0 years |
Tradenames and trademarks |  |  | 30,034 |  |  |  | 10,647 |  |  |  | 19,387 |  |  |  | 9.1 years |
Customer backlog |  |  | 1,000 |  |  |  | 1,000 |  |  |  | — |  |  |  | 0.4 years |
Total intangible assets |  | $ | 515,464 |  |  | $ | 263,173 |  |  | $ | 252,291 |  |  |  | 6.9 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) |
2015 |  | $ | 55,231 |
2016 |  |  | 55,231 |
2017 |  |  | 49,046 |
2018 |  |  | 24,405 |
2019 |  |  | 4,889 |

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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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: 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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- 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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