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Goodwill and Acquired Intangibles (Tables) | 6 Months Ended
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Jun. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill during the six months ended June 29, 2019 were as follows:
| Gross Carrying Amount
| (In thousands)
Balance as of December 29, 2018 | $ | 662,272 |
Effect of foreign currency translation | 441 |
Balance as of June 29, 2019 | $ | 662,713 |
Schedule of acquired intangibles with finite and indefinite lives (excluding goodwill) | Acquired intangibles as of June 29, 2019 were as follows, excluding intangibles that were fully amortized as of December 29, 2018:
| Gross Carrying Amount |  | Accumulated Amortization |  | Acquired Intangibles, Net
| (In thousands)
Existing technology | $ | 363,143 |  |  | $ | (226,643 | ) |  | $ | 136,500 |
Agreements and relationships | 146,452 |  |  | (106,822 | ) |  | 39,630 |
Tradenames, trademarks and patents | 7,600 |  |  | (5,390 | ) |  | 2,210 |
Total acquired intangibles with definite lives | 517,195 |  |  | (338,855 | ) |  | 178,340 |
In-process technology | 19,500 |  |  | — |  |  | 19,500 |
Total acquired intangibles | $ | 536,695 |  |  | $ | (338,855 | ) |  | $ | 197,840 |
Acquired intangibles as of December 29, 2018 were as follows, excluding intangibles that were fully amortized as of December 30, 2017:
| Gross Carrying Amount |  | Accumulated Amortization |  | Acquired Intangibles, Net
| (In thousands)
Existing technology | $ | 330,500 |  |  | $ | (225,383 | ) |  | $ | 105,117 |
Agreements and relationships | 146,426 |  |  | (100,211 | ) |  | 46,215 |
Tradenames, trademarks and patents | 10,718 |  |  | (8,093 | ) |  | 2,625 |
Total acquired intangibles with definite lives | 487,644 |  |  | (333,687 | ) |  | 153,957 |
In-process technology | 71,500 |  |  | — |  |  | 71,500 |
Total acquired intangibles | $ | 559,144 |  |  | $ | (333,687 | ) |  | $ | 225,457 |
Amortization of acquired intangibles | Amortization of acquired intangibles for the three and six months ended June 29, 2019 and June 30, 2018 was as follows:
| Three Months Ended |  | Six Months Ended
| June 29, 2019 |  | June 30, 2018 |  | June 29, 2019 |  | June 30, 2018
| (In thousands)
Cost of product and maintenance | $ | 11,299 |  |  | $ | 9,991 |  |  | $ | 21,153 |  |  | $ | 20,268 |
Amortization of acquired intangibles | 3,159 |  |  | 3,518 |  |  | 6,467 |  |  | 7,148 |
Total amortization of acquired intangibles | $ | 14,458 |  |  | $ | 13,509 |  |  | $ | 27,620 |  |  | $ | 27,416 |
Estimated amortization expense | Estimated amortization expense for acquired intangible assets with definite lives for the following five fiscal years and thereafter is as follows:
| (In thousands)
2019 – remaining period | $ | 25,461 |
2020 | 49,422 |
2021 | 44,758 |
2022 | 26,453 |
2023 | 13,967 |
Thereafter | 18,279 |
Total estimated amortization expense | $ | 178,340 |

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