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Intangible Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 501,124 |  |  | $ | (457,310) |  |  | $ | 43,814 |  |  | $ | 507,669 |  |  | $ | (458,109) |  |  | $ | 49,560 |
Customer contracts and relationships | 372,983 |  |  | (251,122) |  |  | 121,861 |  |  | 381,288 |  |  | (251,509) |  |  | 129,779 |
Trademarks and trade names | 77,613 |  |  | (73,083) |  |  | 4,530 |  |  | 78,837 |  |  | (73,732) |  |  | 5,105 |
Other | 12,019 |  |  | (11,414) |  |  | 605 |  |  | 12,020 |  |  | (11,367) |  |  | 653 |
Total intangible assets | $ | 963,739 |  |  | $ | (792,929) |  |  | $ | 170,810 |  |  | $ | 979,814 |  |  | $ | (794,717) |  |  | $ | 185,097 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 15,458 |  |  | $ | (8,442) |  |  | $ | (23,900) |  |  | $ | 13,450 |  |  | $ | (10,450) |
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Three Months Ended March 31, |  |
In thousands | 2020 |  | 2019
Beginning balance, intangible assets, gross | $ | 979,814 |  |  | $ | 981,160 |
Effect of change in exchange rates | (16,075) |  |  | 2,359 |
Ending balance, intangible assets, gross | $ | 963,739 |  |  | $ | 983,519 |
Beginning balance, intangible liabilities, gross | $ | (23,900) |  |  | $ | (23,900) |
Effect of change in exchange rates | — |  |  | — |
Ending balance, intangible liabilities, gross | $ | (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 March 31, 2020) |  | $ | 39,618 |  |  | $ | (6,020) |  |  | $ | 33,598 |
2021 |  | 37,572 |  |  | (1,963) |  |  | 35,609 |
2022 |  | 27,212 |  |  | (459) |  |  | 26,753 |
2023 |  | 19,674 |  |  | — |  |  | 19,674 |
2024 |  | 15,523 |  |  | — |  |  | 15,523 |
Thereafter |  | 31,211 |  |  | — |  |  | 31,211 |
Total intangible assets subject to amortization (accretion) |  | $ | 170,810 |  |  | $ | (8,442) |  |  | $ | 162,368 |

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