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Intangible Assets and Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2020
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:
| June 30, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 498,006 |  |  | $ | (459,876) |  |  | $ | 38,130 |  |  | $ | 507,669 |  |  | $ | (458,109) |  |  | $ | 49,560 |
Customer contracts and relationships | 365,567 |  |  | (251,085) |  |  | 114,482 |  |  | 381,288 |  |  | (251,509) |  |  | 129,779 |
Trademarks and trade names | 76,631 |  |  | (72,677) |  |  | 3,954 |  |  | 78,837 |  |  | (73,732) |  |  | 5,105 |
Other | 12,021 |  |  | (11,462) |  |  | 559 |  |  | 12,020 |  |  | (11,367) |  |  | 653 |
Total intangible assets | $ | 952,225 |  |  | $ | (795,100) |  |  | $ | 157,125 |  |  | $ | 979,814 |  |  | $ | (794,717) |  |  | $ | 185,097 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 17,465 |  |  | $ | (6,435) |  |  | $ | (23,900) |  |  | $ | 13,450 |  |  | $ | (10,450) |
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Six Months Ended June 30, |  |
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 | (9,449) |  |  | 4,349 |
Intangible Assets, gross ending balance | $ | 952,225 |  |  | $ | 985,509 |
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 |  |  |  |  |  |
2020 (amount remaining at June 30, 2020) |  | $ | 26,345 |  |  | $ | (4,013) |  |  | $ | 22,332 |
2021 |  | 37,479 |  |  | (1,963) |  |  | 35,516 |
2022 |  | 27,138 |  |  | (459) |  |  | 26,679 |
2023 |  | 19,605 |  |  | — |  |  | 19,605 |
2024 |  | 15,469 |  |  | — |  |  | 15,469 |
Thereafter |  | 31,089 |  |  | — |  |  | 31,089 |
Total intangible assets subject to amortization (accretion) |  | $ | 157,125 |  |  | $ | (6,435) |  |  | $ | 150,690 |

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