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Goodwill and Acquired Intangible Assets (Tables) | 9 Months Ended
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Oct. 01, 2017
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the nine months ended October 1, 2017, were as follows:
|  | Industrial Automation |  |  | System Test |  |  | Wireless Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
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 |
Foreign currency translation adjustment |  |  | 25,934 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 25,934 |
Balance at October 1, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 230,785 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 1,011,843 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 230,785 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | — |  |  | $ | 249,277 |
Schedule of Estimated Acquired Intangible Asset Amortization Expense | Estimated acquired intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2017(remainder) |  |  | 7,348 |
2018 |  |  | 29,268 |
2019 |  |  | 25,295 |
2020 |  |  | 11,134 |
2021 |  |  | 3,703 |
Thereafter |  |  | 8,981 |
Wireless Test |
Schedule of Amortizable Acquired Intangible Assets | Amortizable acquired intangible assets consist of the following and are included in acquired intangible assets, net on the balance sheet:
|  | October 1, 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Cumulative Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | (221,051 | ) |  | $ | 1,057 |  |  | $ | 50,883 |
Customer relationships |  |  | 92,741 |  |  |  | (82,286 | ) |  |  | 111 |  |  |  | 10,566 |
Tradenames and trademarks |  |  | 50,100 |  |  |  | (26,171 | ) |  |  | 271 |  |  |  | 24,200 |
Non-compete agreement |  |  | 320 |  |  |  | (240 | ) |  |  | — |  |  |  | 80 |
Total |  | $ | 414,038 |  |  | $ | (329,748 | ) |  | $ | 1,439 |  |  | $ | 85,729 |
|  | December 31, 2016 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Cumulative Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | (206,376 | ) |  | $ | (5,093 | ) |  | $ | 59,408 |
Customer relationships |  |  | 92,741 |  |  |  | (76,707 | ) |  |  | (538 | ) |  |  | 15,496 |
Tradenames and trademarks |  |  | 50,100 |  |  |  | (23,435 | ) |  |  | (1,308 | ) |  |  | 25,357 |
Non-compete agreement |  |  | 320 |  |  |  | (180 | ) |  |  | — |  |  |  | 140 |
Total |  | $ | 414,038 |  |  | $ | (306,698 | ) |  | $ | (6,939 | ) |  | $ | 100,401 |

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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=66006027&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=66006027&loc=d3e16265-109275 + Details
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