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Goodwill and Acquired Intangible Assets (Tables) | 3 Months Ended
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Apr. 04, 2021
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 4, 2021, were as follows:
|  | Industrial Automation |  |  | System Test |  |  | Wireless Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 433,752 |  |  | $ | 158,699 |  |  | $ | 361,819 |  |  | $ | 262,155 |  |  | $ | 1,216,425 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  |  | 433,752 |  |  |  | 10,516 |  |  |  | 7,976 |  |  |  | 1,615 |  |  |  | 453,859 |
Foreign currency translation adjustment |  |  | (16,156 | ) |  |  | — |  |  |  | — |  |  |  | (102 | ) |  |  | (16,258 | )
Balance at April 4, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 417,596 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 262,053 |  |  |  | 1,200,167 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 417,596 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | 1,513 |  |  | $ | 437,601 |
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2021 (remainder) |  |  | 15,896 |
2022 |  |  | 20,423 |
2023 |  |  | 19,941 |
2024 |  |  | 19,634 |
2025 |  |  | 11,699 |
Thereafter |  |  | 5,257 |
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:
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Balance at April 4, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 272,547 |  |  | $ | (213,459 | ) |  | $ | (3,198 | ) |  | $ | 55,890 |
Customer relationships |  |  | 57,739 |  |  |  | (47,209 | ) |  |  | 150 |  |  |  | 10,680 |
Tradenames and trademarks |  |  | 70,120 |  |  |  | (43,716 | ) |  |  | (124 | ) |  |  | 26,280 |
Total intangible assets |  | $ | 400,406 |  |  | $ | (304,384 | ) |  | $ | (3,172 | ) |  | $ | 92,850 |
Balance, December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 272,547 |  |  | $ | (210,479 | ) |  | $ | (1,610 | ) |  | $ | 60,458 |
Customer relationships |  |  | 66,239 |  |  |  | (54,524 | ) |  |  | 305 |  |  |  | 12,020 |
Tradenames and trademarks |  |  | 70,120 |  |  |  | (42,344 | ) |  |  | 685 |  |  |  | 28,461 |
Total intangible assets |  | $ | 408,906 |  |  | $ | (307,347 | ) |  | $ | (620 | ) |  | $ | 100,939 |

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