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Goodwill and Acquired Intangible Assets (Tables) | 3 Months Ended
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Apr. 03, 2022
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 3, 2022, were as follows:
|  | Industrial Automation |  |  | Wireless Test |  |  | Semiconductor Test |  |  | System Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 405,971 |  |  | $ | 361,819 |  |  | $ | 262,101 |  |  | $ | 158,699 |  |  | $ | 1,188,590 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
Total goodwill |  |  | 405,971 |  |  |  | 7,976 |  |  |  | 1,561 |  |  |  | 10,516 |  |  |  | 426,024 |
Foreign currency translation adjustment |  |  | (6,122 | ) |  |  | — |  |  |  | (14 | ) |  |  | — |  |  |  | (6,136 | )
Balance at April 3, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 399,849 |  |  |  | 361,819 |  |  |  | 262,087 |  |  |  | 158,699 |  |  |  | 1,182,454 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
Total goodwill |  | $ | 399,849 |  |  | $ | 7,976 |  |  | $ | 1,547 |  |  | $ | 10,516 |  |  | $ | 419,888 |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Balance at April 3, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 272,547 |  |  | $ | (226,648 | ) |  | $ | (4,565 | ) |  | $ | 41,334 |
Customer relationships |  |  | 57,739 |  |  |  | (49,492 | ) |  |  | 194 |  |  |  | 8,441 |
Tradenames and trademarks |  |  | 59,387 |  |  |  | (38,494 | ) |  |  | (822 | ) |  |  | 20,071 |
Total intangible assets |  | $ | 389,673 |  |  | $ | (314,634 | ) |  | $ | (5,193 | ) |  | $ | 69,846 |
Balance, December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 272,547 |  |  | $ | (223,413 | ) |  | $ | (4,093 | ) |  | $ | 45,041 |
Customer relationships |  |  | 57,739 |  |  |  | (48,921 | ) |  |  | 209 |  |  |  | 9,027 |
Tradenames and trademarks |  |  | 59,387 |  |  |  | (37,237 | ) |  |  | (583 | ) |  |  | 21,567 |
Total intangible assets |  | $ | 389,673 |  |  | $ | (309,571 | ) |  | $ | (4,467 | ) |  | $ | 75,635 |
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2022 |  | $ | 14,879 |
2023 |  |  | 19,377 |
2024 |  |  | 19,069 |
2025 |  |  | 11,456 |
2026 |  |  | 2,404 |
Thereafter |  |  | 2,661 |

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