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Intangible Assets and Liabilities | 6 Months Ended
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Jun. 30, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets and Liabilities | Intangible Assets and Liabilities The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
| June 30, 2019 |  | December 31, 2018
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 511,967 |  |  | $ | (446,653 | ) |  | $ | 65,314 |  |  | $ | 507,100 |  |  | $ | (429,955 | ) |  | $ | 77,145 |
Customer contracts and relationships | 382,397 |  |  | (233,664 | ) |  | 148,733 |  |  | 379,614 |  |  | (212,538 | ) |  | 167,076 |
Trademarks and trade names | 79,123 |  |  | (72,138 | ) |  | 6,985 |  |  | 78,746 |  |  | (69,879 | ) |  | 8,867 |
Other | 12,022 |  |  | (11,287 | ) |  | 735 |  |  | 12,600 |  |  | (11,205 | ) |  | 1,395 |
Total intangible assets subject to amortization | 985,509 |  |  | (763,742 | ) |  | 221,767 |  |  | 978,060 |  |  | (723,577 | ) |  | 254,483 |
In-process research and development | — |  |  | — |  |  | — |  |  | 3,100 |  |  | — |  |  | 3,100 |
Total intangible assets | $ | 985,509 |  |  | $ | (763,742 | ) |  | $ | 221,767 |  |  | $ | 981,160 |  |  | $ | (723,577 | ) |  | $ | 257,583 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900 | ) |  | $ | 9,333 |  |  | $ | (14,567 | ) |  | $ | (23,900 | ) |  | $ | 5,217 |  |  | $ | (18,683 | )
A summary of intangible assets and liabilities activity is as follows:
| Six Months Ended June 30,
In thousands | 2019 |  | 2018
Beginning balance, intangible assets, gross | $ | 981,160 |  |  | $ | 769,851 |
Intangible assets acquired | — |  |  | 241,539 |
Effect of change in exchange rates | 4,349 |  |  | (18,883 | )
Ending balance, intangible assets, gross | $ | 985,509 |  |  | $ | 992,507 |
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 | )
On January 5, 2018, we completed our acquisition of Silver Spring Networks, Inc. (SSNI) by purchasing 100% of the voting stock. Acquired intangible assets include in-process research and development (IPR&D), which is not amortized until such time as the associated development projects are completed. Of these projects, $3.1 million were completed during the first half of 2019 and are included in core-developed technology. Acquired intangible liabilities reflect the present value of the projected cash outflows for an existing contract where remaining costs are expected to exceed projected revenues. Estimated future annual amortization (accretion) is as follows:
Year Ending December 31, |  | Amortization |  | Accretion |  | Estimated Annual Amortization, net
In thousands |  |
2019 (amount remaining at June 30, 2019) |  | $ | 36,345 |  |  | $ | (4,117 | ) |  | $ | 32,228 |
2020 |  | 53,126 |  |  | (8,028 | ) |  | 45,098 |
2021 |  | 37,772 |  |  | (1,963 | ) |  | 35,809 |
2022 |  | 27,407 |  |  | (459 | ) |  | 26,948 |
2023 |  | 19,825 |  |  | — |  |  | 19,825 |
Beyond 2023 |  | 47,292 |  |  | — |  |  | 47,292 |
Total intangible assets subject to amortization (accretion) |  | $ | 221,767 |  |  | $ | (14,567 | ) |  | $ | 207,200 |
We have recognized $16.1 million and $18.0 million of net amortization of intangible assets for the three months ended June 30, 2019 and 2018, respectively, and $32.1 million and $35.7 million for the six months ended June 30, 2019 and 2018, respectively, within operating expenses in the Consolidated Statement of Operations. These expenses relate to intangible assets and liabilities acquired as part of business combinations.

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