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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015 are as follows:
|  | Industrial Automation |  |  | System Test |  |  | Wireless Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | — |  |  | $ | 158,699 |  |  | $ | 361,819 |  |  | $ | 260,540 |  |  | $ | 781,058 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (98,897 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
|  |  | — |  |  |  | 10,516 |  |  |  | 262,922 |  |  |  | — |  |  |  | 273,438 |
Universal Robots acquisition |  |  | 221,128 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 221,128 |
Foreign currency translation adjustment |  |  | (6,153 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (6,153 | )
Balance at December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 214,975 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 996,033 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (98,897 | ) |  |  | (260,540 | ) |  |  | (507,620 | )
|  |  | 214,975 |  |  |  | 10,516 |  |  |  | 262,922 |  |  |  | — |  |  |  | 488,413 |
Foreign currency translation adjustment |  |  | (10,124 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,124 | )
Goodwill impairment losses |  |  | — |  |  |  | — |  |  |  | (254,946 | ) |  |  | — |  |  |  | (254,946 | )
Balance at December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 204,851 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 985,909 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 204,851 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | — |  |  | $ | 223,343 |
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, 2016 |
|  | Gross Carrying Amount (1) |  |  | Accumulated Amortization (1)(2) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | 206,376 |  |  | $ | (5,093 | ) |  | $ | 59,408 |  |  |  | 6.0 years |
Customer relationships |  |  | 92,741 |  |  |  | 76,707 |  |  |  | (538 | ) |  |  | 15,496 |  |  |  | 7.9 years |
Tradenames and trademarks |  |  | 50,100 |  |  |  | 23,435 |  |  |  | (1,308 | ) |  |  | 25,357 |  |  |  | 9.5 years |
Non-compete agreement |  |  | 320 |  |  |  | 180 |  |  |  | — |  |  |  | 140 |  |  |  | 4.0 years |
Customer backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 414,208 |  |  | $ | 306,868 |  |  | $ | (6,939 | ) |  | $ | 100,401 |  |  |  | 6.8 years |
(1) | During the year ended December 31, 2016, Teradyne recorded an $83.3 million impairment of Wireless Test amortizable intangible assets. The impairment assets have been eliminated from the gross carrying amount and accumulated amortization.
(2) | In 2016, $48.1 million of amortizable intangible assets became fully amortized and has been eliminated from the gross carrying amount and accumulated amortization.
|  | December 31, 2015 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization (1)(2) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |  |  | Weighted Average Useful Life |
|  | (in thousands) |
Developed technology |  | $ | 382,262 |  |  | $ | 220,346 |  |  | $ | (2,444 | ) |  | $ | 159,472 |  |  |  | 6.0 years |
Customer relationships |  |  | 110,602 |  |  |  | 63,722 |  |  |  | (258 | ) |  |  | 46,622 |  |  |  | 7.9 years |
Tradenames and trademarks |  |  | 53,034 |  |  |  | 18,889 |  |  |  | (628 | ) |  |  | 33,517 |  |  |  | 9.5 years |
Non-compete agreement |  |  | 320 |  |  |  | 100 |  |  |  | — |  |  |  | 220 |  |  |  | 4.0 years |
Customer backlog |  |  | 170 |  |  |  | 170 |  |  |  | — |  |  |  | — |  |  |  | 0.3 years |
Total intangible assets |  | $ | 546,388 |  |  | $ | 303,227 |  |  | $ | (3,330 | ) |  | $ | 239,831 |  |  |  | 6.7 years |
(1) | During the year ended December 31, 2015, Teradyne recorded intangible assets in the amount of $121.6 million related to its Universal Robots acquisition.
(2) | During the year ended December 31, 2015, Teradyne wrote off $98.2 million of fully amortized intangible assets.
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2017 |  | $ | 28,986 |
2018 |  |  | 26,848 |
2019 |  |  | 23,037 |
2020 |  |  | 10,042 |
2021 |  |  | 3,435 |
Thereafter |  |  | 8,053 |

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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=66006027&loc=d3e16323-109275 + Details
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