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Intangible Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2021 |  | December 31, 2020
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 514,416 |  |  | $ | (491,146) |  |  | $ | 23,270 |  |  | $ | 525,051 |  |  | $ | (498,113) |  |  | $ | 26,938 |
Customer contracts and relationships | 378,430 |  |  | (281,965) |  |  | 96,465 |  |  | 383,245 |  |  | (280,497) |  |  | 102,748 |
Trademarks and trade names | 78,763 |  |  | (76,055) |  |  | 2,708 |  |  | 79,716 |  |  | (76,912) |  |  | 2,804 |
Other | 12,024 |  |  | (11,606) |  |  | 418 |  |  | 12,025 |  |  | (11,560) |  |  | 465 |
Total intangible assets | $ | 983,633 |  |  | $ | (860,772) |  |  | $ | 122,861 |  |  | $ | 1,000,037 |  |  | $ | (867,082) |  |  | $ | 132,955 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 21,969 |  |  | $ | (1,931) |  |  | $ | (23,900) |  |  | $ | 21,479 |  |  | $ | (2,421) |
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Three Months Ended March 31,
In thousands | 2021 |  | 2020
Intangible assets, gross beginning balance | $ | 1,000,037 |  |  | $ | 979,814 |
Effect of change in exchange rates | (16,404) |  |  | (16,075) |
Intangible assets, gross ending balance | $ | 983,633 |  |  | $ | 963,739 |
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 March 31, 2021) |  | $ | 28,447 |  |  | $ | (1,472) |  |  | $ | 26,975 |
2022 |  | 27,516 |  |  | (459) |  |  | 27,057 |
2023 |  | 19,898 |  |  | — |  |  | 19,898 |
2024 |  | 15,700 |  |  | — |  |  | 15,700 |
2025 |  | 14,706 |  |  | — |  |  | 14,706 |
Thereafter |  | 16,594 |  |  | — |  |  | 16,594 |
Total intangible assets subject to amortization (accretion) |  | $ | 122,861 |  |  | $ | (1,931) |  |  | $ | 120,930 |

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