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Intangible Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 |  | December 31, 2017
| Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
| (in thousands)
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 515,949 |  |  | $ | (427,069 | ) |  | $ | 88,880 |  |  | $ | 429,548 |  |  | $ | (399,969 | ) |  | $ | 29,579 |
Customer contracts and relationships | 385,148 |  |  | (210,735 | ) |  | 174,413 |  |  | 258,586 |  |  | (197,582 | ) |  | 61,004 |
Trademarks and trade names | 79,739 |  |  | (69,376 | ) |  | 10,363 |  |  | 70,056 |  |  | (66,004 | ) |  | 4,052 |
Other | 12,602 |  |  | (11,166 | ) |  | 1,436 |  |  | 11,661 |  |  | (11,068 | ) |  | 593 |
Total intangible assets subject to amortization | $ | 993,438 |  |  | $ | (718,346 | ) |  | $ | 275,092 |  |  | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |
In-process research and development | 3,100 |  |  | — |  |  | 3,100 |  |  | — |  |  | — |  |  | — |
Total intangible assets | $ | 996,538 |  |  | $ | (718,346 | ) |  | $ | 278,192 |  |  | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900 | ) |  | $ | 3,913 |  |  | $ | (19,987 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
Summary of Intangible Asset Account Activity | A summary of intangible assets and liabilities activity is as follows:
| Nine Months Ended September 30,
| 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 | (15,352 | ) |  | 57,640 |
Ending balance, intangible assets, gross | $ | 996,538 |  |  | $ | 764,036 |
Beginning balance, intangible liabilities, gross | $ | — |  |  | $ | — |
Intangible liabilities acquired | (23,900 | ) |  | — |
Effect of change in exchange rates | — |  |  | — |
Ending balance, intangible liabilities, gross | $ | (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)
2018 (amount remaining at September 30, 2018) |  | $ | 19,547 |  |  | $ | (1,304 | ) |  | $ | 18,243 |
2019 |  | 72,681 |  |  | (8,233 | ) |  | 64,448 |
2020 |  | 52,727 |  |  | (8,028 | ) |  | 44,699 |
2021 |  | 37,314 |  |  | (1,963 | ) |  | 35,351 |
2022 |  | 27,160 |  |  | (459 | ) |  | 26,701 |
Beyond 2022 |  | 65,663 |  |  | — |  |  | 65,663 |
Total intangible assets subject to amortization (accretion) |  | $ | 275,092 |  |  | $ | (19,987 | ) |  | $ | 255,105 |

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