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Schedule of Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 |  | December 31, 2017
| Gross Assets |  | Accumulated (Amortization) Accretion |  | Net |  | Gross Assets |  | Accumulated (Amortization) Accretion |  | Net
| (in thousands)
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 507,100 |  |  | $ | (429,955 | ) |  | $ | 77,145 |  |  | $ | 429,548 |  |  | $ | (399,969 | ) |  | $ | 29,579 |
Customer contracts and relationships | 379,614 |  |  | (212,538 | ) |  | 167,076 |  |  | 258,586 |  |  | (197,582 | ) |  | 61,004 |
Trademarks and trade names | 78,746 |  |  | (69,879 | ) |  | 8,867 |  |  | 70,056 |  |  | (66,004 | ) |  | 4,052 |
Other | 12,600 |  |  | (11,205 | ) |  | 1,395 |  |  | 11,661 |  |  | (11,068 | ) |  | 593 |
Total intangible assets subject to amortization | 978,060 |  |  | (723,577 | ) |  | 254,483 |  |  | 769,851 |  |  | (674,623 | ) |  | 95,228 |
In-process research and development | 3,100 |  |  |  |  | 3,100 |  |  | — |  |  |  |  | — |
Total intangible assets | $ | 981,160 |  |  | $ | (723,577 | ) |  | $ | 257,583 |  |  | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (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,
| 2018 |  | 2017
| (in thousands)
Beginning balance, intangible assets, gross | $ | 769,851 |  |  | $ | 669,896 |
Intangible assets acquired | 242,039 |  |  | 36,500 |
Effect of change in exchange rates | (30,730 | ) |  | 63,455 |
Ending balance, intangible assets, gross | $ | 981,160 |  |  | $ | 769,851 |
Beginning balance, intangible liabilities, gross | $ | — |  |  | $ | — |
Intangible liabilities acquired | (23,900 | ) |  | — |
Effect of change in exchange rates | — |  |  | — |
Ending balance, intangible liabilities, gross | $ | (23,900 | ) |  | $ | — |
Finite-lived Intangible Assets Amortization Expense | A summary of intangible asset amortization expense is as follows:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Amortization expense | $ | 71,713 |  |  | $ | 20,785 |  |  | $ | 25,112 |
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)
2019 | $ | 72,512 |  |  | $ | (8,233 | ) |  | $ | 64,279 |
2020 | 52,591 |  |  | (8,028 | ) |  | 44,563 |
2021 | 37,124 |  |  | (1,963 | ) |  | 35,161 |
2022 | 26,950 |  |  | (459 | ) |  | 26,491 |
2023 | 19,363 |  |  | — |  |  | 19,363 |
Beyond 2023 | 45,943 |  |  | — |  |  | 45,943 |
Total intangible assets subject to amortization | $ | 254,483 |  |  | $ | (18,683 | ) |  | $ | 235,800 |

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