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Intangible Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2019 |  | December 31, 2018
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 500,624 |  |  | $ | (443,313 | ) |  | $ | 57,311 |  |  | $ | 507,100 |  |  | $ | (429,955 | ) |  | $ | 77,145 |
Customer contracts and relationships | 375,094 |  |  | (236,824 | ) |  | 138,270 |  |  | 379,614 |  |  | (212,538 | ) |  | 167,076 |
Trademarks and trade names | 77,848 |  |  | (71,803 | ) |  | 6,045 |  |  | 78,746 |  |  | (69,879 | ) |  | 8,867 |
Other | 12,020 |  |  | (11,325 | ) |  | 695 |  |  | 12,600 |  |  | (11,205 | ) |  | 1,395 |
Total intangible assets subject to amortization | 965,586 |  |  | (763,265 | ) |  | 202,321 |  |  | 978,060 |  |  | (723,577 | ) |  | 254,483 |
In-process research and development | — |  |  | — |  |  | — |  |  | 3,100 |  |  | — |  |  | 3,100 |
Total intangible assets | $ | 965,586 |  |  | $ | (763,265 | ) |  | $ | 202,321 |  |  | $ | 981,160 |  |  | $ | (723,577 | ) |  | $ | 257,583 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900 | ) |  | $ | 11,392 |  |  | $ | (12,508 | ) |  | $ | (23,900 | ) |  | $ | 5,217 |  |  | $ | (18,683 | )
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Nine Months Ended September 30,
In thousands | 2019 |  | 2018
Beginning balance, intangible assets, gross | $ | 981,160 |  |  | $ | 769,851 |
Intangible assets acquired | — |  |  | 242,039 |
Effect of change in exchange rates | (15,574 | ) |  | (15,352 | )
Ending balance, intangible assets, gross | $ | 965,586 |  |  | $ | 996,538 |
Beginning balance, intangible liabilities, gross | $ | (23,900 | ) |  | $ | — |
Intangible liabilities assumed | — |  |  | (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 |  |
2019 (amount remaining at September 30, 2019) |  | $ | 18,162 |  |  | $ | (2,058 | ) |  | $ | 16,104 |
2020 |  | 52,850 |  |  | (8,028 | ) |  | 44,822 |
2021 |  | 37,547 |  |  | (1,963 | ) |  | 35,584 |
2022 |  | 27,212 |  |  | (459 | ) |  | 26,753 |
2023 |  | 19,678 |  |  | — |  |  | 19,678 |
Thereafter |  | 46,872 |  |  | — |  |  | 46,872 |
Total intangible assets subject to amortization (accretion) |  | $ | 202,321 |  |  | $ | (12,508 | ) |  | $ | 189,813 |

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