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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Apr. 02, 2017
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 2, 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 |  |  | 6,722 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,722 |
Balance at April 2, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 211,573 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 992,631 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 211,573 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | — |  |  | $ | 230,065 |
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) |
2017 (remainder) |  |  | 21,621 |
2018 |  |  | 27,475 |
2019 |  |  | 23,622 |
2020 |  |  | 10,325 |
2021 |  |  | 3,504 |
Thereafter |  |  | 8,296 |
Wireless Test |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | April 2, 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Cumulative Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,877 |  |  | $ | (211,065 | ) |  | $ | (3,292 | ) |  | $ | 56,520 |
Customer relationships |  |  | 92,741 |  |  |  | (79,114 | ) |  |  | (348 | ) |  |  | 13,279 |
Tradenames and trademarks |  |  | 50,100 |  |  |  | (24,331 | ) |  |  | (845 | ) |  |  | 24,924 |
Non-compete agreement |  |  | 320 |  |  |  | (200 | ) |  |  | — |  |  |  | 120 |
Customer backlog |  |  | 170 |  |  |  | (170 | ) |  |  | — |  |  |  | — |
Total intangible assets |  | $ | 414,208 |  |  | $ | (314,880 | ) |  | $ | (4,485 | ) |  | $ | 94,843 |
|  | 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 |
Customer backlog |  |  | 170 |  |  |  | (170 | ) |  |  | — |  |  |  | — |
Total intangible assets |  | $ | 414,208 |  |  | $ | (306,868 | ) |  | $ | (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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