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Schedule of Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, are as follows:
| December 31, 2019 |  |  |  |  |  | December 31, 2018 |  |  |  |
In thousands | Gross Assets |  | Accumulated (Amortization) Accretion |  | Net |  | Gross Assets |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 507,669 |  |  | $ | (458,109) |  |  | $ | 49,560 |  |  | $ | 507,100 |  |  | $ | (429,955) |  |  | $ | 77,145 |
Customer contracts and relationships | 381,288 |  |  | (251,509) |  |  | 129,779 |  |  | 379,614 |  |  | (212,538) |  |  | 167,076 |
Trademarks and trade names | 78,837 |  |  | (73,732) |  |  | 5,105 |  |  | 78,746 |  |  | (69,879) |  |  | 8,867 |
Other | 12,020 |  |  | (11,367) |  |  | 653 |  |  | 12,600 |  |  | (11,205) |  |  | 1,395 |
Total intangible assets subject to amortization | 979,814 |  |  | (794,717) |  |  | 185,097 |  |  | 978,060 |  |  | (723,577) |  |  | 254,483 |
In-process research and development | — |  |  |  |  |  | — |  |  | 3,100 |  |  |  |  | 3,100 |
Total intangible assets | $ | 979,814 |  |  | $ | (794,717) |  |  | $ | 185,097 |  |  | $ | 981,160 |  |  | $ | (723,577) |  |  | $ | 257,583 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 13,450 |  |  | $ | (10,450) |  |  | $ | (23,900) |  |  | $ | 5,217 |  |  | $ | (18,683) |
Summary Of Intangible Asset Account Activity | A summary of the intangible assets and liabilities account activity is as follows:
| Year Ended December 31, |  |
In thousands | 2019 |  | 2018
Beginning balance, intangible assets, gross | $ | 981,160 |  |  | $ | 769,851 |
Intangible assets acquired | — |  |  | 242,039 |
Effect of change in exchange rates | (1,346) |  |  | (30,730) |
Ending balance, intangible assets, gross | $ | 979,814 |  |  | $ | 981,160 |
Beginning balance, intangible liabilities, gross | $ | (23,900) |  |  | $ | — |
Intangible liabilities acquired | — |  |  | (23,900) |
Effect of change in exchange rates | — |  |  | — |
Ending balance, intangible liabilities, gross | $ | (23,900) |  |  | $ | (23,900) |
Schedule of Finite-Lived 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 | $ | 53,028 |  |  | $ | (8,028) |  |  | $ | 45,000 |
2021 | 37,705 |  |  | (1,963) |  |  | 35,742 |
2022 | 27,346 |  |  | (459) |  |  | 26,887 |
2023 | 19,785 |  |  | — |  |  | 19,785 |
2024 | 15,612 |  |  | — |  |  | 15,612 |
Thereafter | 31,621 |  |  |  | — |  |  | 31,621 |
Total intangible assets subject to amortization | $ | 185,097 |  |  | $ | (10,450) |  |  | $ | 174,647 |
Finite-lived Intangible Assets Amortization Expense |
Amortization Expense | Year Ended December 31, |  |  |  |
In thousands | 2019 |  | 2018 |  | 2017
Amortization expense | $ | 64,286 |  |  | $ | 71,713 |  |  | $ | 20,785 |

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