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Intangible Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Intangible Assets by Major Class | The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
| September 30, 2021 |  | December 31, 2020
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 511,885 |  |  | $ | (495,799) |  |  | $ | 16,086 |  |  | $ | 525,051 |  |  | $ | (498,113) |  |  | $ | 26,938 |
Customer contracts and relationships | 376,572 |  |  | (291,783) |  |  | 84,789 |  |  | 383,245 |  |  | (280,497) |  |  | 102,748 |
Trademarks and trade names | 78,448 |  |  | (75,933) |  |  | 2,515 |  |  | 79,716 |  |  | (76,912) |  |  | 2,804 |
Other | 12,023 |  |  | (11,650) |  |  | 373 |  |  | 12,025 |  |  | (11,560) |  |  | 465 |
Total intangible assets | $ | 978,928 |  |  | $ | (875,165) |  |  | $ | 103,763 |  |  | $ | 1,000,037 |  |  | $ | (867,082) |  |  | $ | 132,955 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 22,950 |  |  | $ | (950) |  |  | $ | (23,900) |  |  | $ | 21,479 |  |  | $ | (2,421) |
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Nine Months Ended September 30,
In thousands | 2021 |  | 2020
Intangible assets, gross beginning balance | $ | 1,000,037 |  |  | $ | 979,814 |
Intangibles disposed in sale of business | — |  |  | (18,140) |
Effect of change in exchange rates | (21,109) |  |  | 9,974 |
Intangible assets, gross ending balance | $ | 978,928 |  |  | $ | 971,648 |
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 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 (amount remaining at September 30, 2021) |  | $ | 9,450 |  |  | $ | (491) |  |  | $ | 8,959 |
2022 |  | 27,393 |  |  | (459) |  |  | 26,934 |
2023 |  | 19,811 |  |  | — |  |  | 19,811 |
2024 |  | 15,631 |  |  | — |  |  | 15,631 |
2025 |  | 14,655 |  |  | — |  |  | 14,655 |
Thereafter |  | 16,823 |  |  | — |  |  | 16,823 |
Total intangible assets subject to amortization (accretion) |  | $ | 103,763 |  |  | $ | (950) |  |  | $ | 102,813 |

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