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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in goodwill | The following table presents the change in goodwill for the periods indicated:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
Balance at the beginning of the period | $ | 240,939 |  |  | $ | 240,939 |  |  | $ | 119,029 |
Additions as a result of acquisitions (1) | — |  |  | — |  |  | 121,910 |
Balance at the end of the period | $ | 240,939 |  |  | $ | 240,939 |  |  | $ | 240,939 |
(1) See Note (2) Business Combinations
Change in other intangible assets | The following table presents the change in other intangible assets for the periods indicated:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
Balance at the beginning of the period | $ | 16,613 |  |  | $ | 20,614 |  |  | $ | 6,088 |
Additions as a result of acquisitions (1) | — |  |  | — |  |  | 18,345 |
Amortization | (3,525) |  |  | (4,001) |  |  | (3,819) |
Balance at the end of the period | $ | 13,088 |  |  | $ | 16,613 |  |  | $ | 20,614 |
(1) See Note (2) Business Combinations
Estimated aggregate amortization expense for future years | The estimated aggregate amortization expense related to these intangible assets for future years is as follows:
| Year Ending December 31,
| (In thousands)
2021 | $ | 3,111 |
2022 | 2,750 |
2023 | 2,435 |
2024 | 1,640 |
2025 | 1,173 |
Thereafter | 1,979 |
Total | $ | 13,088 |

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