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Schedule of Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
| December 31, 2020 |  | December 31, 2019
In thousands | Gross Assets |  | Accumulated (Amortization) Accretion |  | Net |  | Gross Assets |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 525,051 |  |  | $ | (498,113) |  |  | $ | 26,938 |  |  | $ | 507,669 |  |  | $ | (458,109) |  |  | $ | 49,560 |
Customer contracts and relationships | 383,245 |  |  | (280,497) |  |  | 102,748 |  |  | 381,288 |  |  | (251,509) |  |  | 129,779 |
Trademarks and trade names | 79,716 |  |  | (76,912) |  |  | 2,804 |  |  | 78,837 |  |  | (73,732) |  |  | 5,105 |
Other | 12,025 |  |  | (11,560) |  |  | 465 |  |  | 12,020 |  |  | (11,367) |  |  | 653 |
Total intangible assets | $ | 1,000,037 |  |  | $ | (867,082) |  |  | $ | 132,955 |  |  | $ | 979,814 |  |  | $ | (794,717) |  |  | $ | 185,097 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 21,479 |  |  | $ | (2,421) |  |  | $ | (23,900) |  |  | $ | 13,450 |  |  | $ | (10,450) |
Summary Of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Year Ended December 31,
In thousands | 2020 |  | 2019
Intangible assets, gross beginning balance | $ | 979,814 |  |  | $ | 981,160 |
Intangibles disposed in sale of business | (18,140) |  |  | — |
Effect of change in exchange rates | 38,363 |  |  | (1,346) |
Intangible assets, gross ending balance | $ | 1,000,037 |  |  | $ | 979,814 |
Intangible liabilities, gross beginning balance | $ | (23,900) |  |  | $ | (23,900) |
Effect of change in exchange rates | — |  |  | — |
Intangible liabilities, gross ending balance | $ | (23,900) |  |  | $ | (23,900) |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated future annual amortization (accretion) is as follows:
Year Ending December 31, | Amortization |  | Accretion |  | Estimated Annual Amortization, net
In thousands |
2021 | $ | 38,033 |  |  | $ | (1,962) |  |  | $ | 36,071 |
2022 | 27,599 |  |  | (459) |  |  | 27,140 |
2023 | 19,955 |  |  | — |  |  | 19,955 |
2024 | 15,746 |  |  | — |  |  | 15,746 |
2025 | 14,742 |  |  | — |  |  | 14,742 |
Thereafter | 16,880 |  |  | — |  |  | 16,880 |
Total intangible assets subject to amortization (accretion) | $ | 132,955 |  |  | $ | (2,421) |  |  | $ | 130,534 |
Finite-lived Intangible Assets Amortization Expense |
Amortization Expense | Year Ended December 31,
In thousands | 2020 |  | 2019 |  | 2018
Amortization expense | $ | 44,711 |  |  | $ | 64,286 |  |  | $ | 71,713 |

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