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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 29, 2018
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 9. Goodwill and Other Intangible Assets Goodwill The following summarizes the activity in goodwill for the years ended December 29, 2018 and December 30, 2017 (in thousands):
|  | Year Ended |
--- | --- | --- | ---
|  | December 29, 2018 |  | December 30, 2017 |
Beginning balance |  | $ | 288,227 |  | $ | 276,130 |
Additions due to business combinations |  |  | 109,117 |  |  | 12,097 |
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Ending balance |  | $ | 397,344 |  | $ | 288,227 |
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Other Intangible Assets The gross carrying amount and accumulated amortization of other intangible assets are as follows (in thousands):
|  |  |  | December 29, 2018 |  | December 30, 2017 |
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|  | Weighted-Average Amortization Period (Years) |
|  | Gross Amount |  | Accumulated Amortization |  | Gross Amount |  | Accumulated Amortization |
Core and developed technology |  | 8 |  | $ | 237,265 |  | $ | (102,116 | ) | $ | 161,700 |  | $ | (89,442 | )
Customer relationships |  | 5 |  |  | 46,890 |  |  | (21,075 | ) |  | 25,470 |  |  | (16,180 | )
Patents |  | — |  |  | — |  |  | — |  |  | 3,000 |  |  | (2,750 | )
Trademarks |  | 7 |  |  | 12,310 |  |  | (2,442 | ) |  | 3,690 |  |  | (2,344 | )
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Total |  | 8 |  | $ | 296,465 |  | $ | (125,633 | ) | $ | 193,860 |  | $ | (110,716 | )
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Gross intangible assets increased $125.7 million in fiscal 2018 for assets added due to the acquisition of Z-Wave business. This increase was offset by $23.1 million due to the removal of fully amortized assets. Amortization expense related to intangible assets for fiscal 2018, 2017 and 2016 was $38.0 million, $27.1 million and $27.3 million, respectively. The estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years is as follows (in thousands):
Fiscal Year |  |  |
--- | --- | --- | ---
2019 |  | $ | 39,222 |
2020 |  |  | 36,727 |
2021 |  |  | 32,337 |
2022 |  |  | 24,206 |
2023 |  |  | 18,286 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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