| 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: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2024 | | December 31, 2023 | | In thousands | Gross | | Accumulated (Amortization) Accretion | | Net | | Gross | | Accumulated (Amortization) Accretion | | Net | | Intangible Assets | | | | | | | | | | | | | Core-developed technology | $ | 512,787 | | | $ | (498,434) | | | $ | 14,353 | | | $ | 502,010 | | | $ | (499,571) | | | $ | 2,439 | | | Customer contracts and relationships | 328,438 | | | (287,386) | | | 41,052 | | | 329,688 | | | (287,653) | | | 42,035 | | | Trademarks and trade names | 72,775 | | | (71,130) | | | 1,645 | | | 73,461 | | | (71,740) | | | 1,721 | | | Other | 12,019 | | | (11,946) | | | 73 | | | 12,019 | | | (11,932) | | | 87 | | | | | | | | | | | | | | | | | | | | | | | | | | Total intangible assets | $ | 926,019 | | | $ | (868,896) | | | $ | 57,123 | | | $ | 917,178 | | | $ | (870,896) | | | $ | 46,282 | | | | | | | | | | | | | | | Intangible Liabilities | | | | | | | | | | | | | Customer contracts and relationships | $ | (23,900) | | | $ | 23,900 | | | $ | — | | | $ | (23,900) | | | $ | 23,900 | | | $ | — | |
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| Summary of Intangible Asset Account Activity |
A summary of intangible assets and liabilities activity is as follows: | | | | | | | | | | | | | Three Months Ended March 31, | | In thousands | 2024 | | 2023 | | Intangible assets, gross beginning balance | $ | 917,178 | | | $ | 905,134 | | Intangible assets acquired (1) | 15,000 | | | — | | | | | | | | | | | Effect of change in exchange rates | (6,159) | | | 4,929 | | | Intangible assets, gross ending balance | $ | 926,019 | | | $ | 910,063 | | | | | | | Intangible liabilities, gross beginning balance | $ | (23,900) | | | $ | (23,900) | | | | | | | Effect of change in exchange rates | — | | | — | | | Intangible liabilities, gross ending balance | $ | (23,900) | | | $ | (23,900) | |
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| Schedule of Intangible Assets, Future Amortization Expense |
Estimated future annual amortization is as follows: | | | | | | | | | | | | | | Year Ending December 31, | | Estimated Annual Amortization | | | | | | In thousands | | | | 2024 (amount remaining at March 31, 2024) | | $ | 12,608 | | | | | | | 2025 | | 16,161 | | | | | | | 2026 | | 12,145 | | | | | | | 2027 | | 7,449 | | | | | | | 2028 | | 1,993 | | | | | | | Thereafter | | 6,767 | | | | | | | Total intangible assets subject to amortization | | $ | 57,123 | | | | | |
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