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Intangible Assets and Liabilities | 3 Months Ended
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Mar. 31, 2020
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:
| March 31, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
In thousands | Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 501,124 |  |  | $ | (457,310) |  |  | $ | 43,814 |  |  | $ | 507,669 |  |  | $ | (458,109) |  |  | $ | 49,560 |
Customer contracts and relationships | 372,983 |  |  | (251,122) |  |  | 121,861 |  |  | 381,288 |  |  | (251,509) |  |  | 129,779 |
Trademarks and trade names | 77,613 |  |  | (73,083) |  |  | 4,530 |  |  | 78,837 |  |  | (73,732) |  |  | 5,105 |
Other | 12,019 |  |  | (11,414) |  |  | 605 |  |  | 12,020 |  |  | (11,367) |  |  | 653 |
Total intangible assets | $ | 963,739 |  |  | $ | (792,929) |  |  | $ | 170,810 |  |  | $ | 979,814 |  |  | $ | (794,717) |  |  | $ | 185,097 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900) |  |  | $ | 15,458 |  |  | $ | (8,442) |  |  | $ | (23,900) |  |  | $ | 13,450 |  |  | $ | (10,450) |
A summary of intangible assets and liabilities activity is as follows:
| Three Months Ended March 31, |  |
In thousands | 2020 |  | 2019
Beginning balance, intangible assets, gross | $ | 979,814 |  |  | $ | 981,160 |
Effect of change in exchange rates | (16,075) |  |  | 2,359 |
Ending balance, intangible assets, gross | $ | 963,739 |  |  | $ | 983,519 |
Beginning balance, intangible liabilities, gross | $ | (23,900) |  |  | $ | (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) and acquired intangible assets including in-process research and development (IPR&D), which were completed during 2019 and are now included within core-developed technology. Assumed 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 |  |  |  |  |  |
2020 (amount remaining at March 31, 2020) |  | $ | 39,618 |  |  | $ | (6,020) |  |  | $ | 33,598 |
2021 |  | 37,572 |  |  | (1,963) |  |  | 35,609 |
2022 |  | 27,212 |  |  | (459) |  |  | 26,753 |
2023 |  | 19,674 |  |  | — |  |  | 19,674 |
2024 |  | 15,523 |  |  | — |  |  | 15,523 |
Thereafter |  | 31,211 |  |  | — |  |  | 31,211 |
Total intangible assets subject to amortization (accretion) |  | $ | 170,810 |  |  | $ | (8,442) |  |  | $ | 162,368 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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