| Other intangible assets |
Other intangible assets at September 30, 2022 and December 31, 2021 consisted of the following (in thousands): | | | | | | | | | | | | September 30, 2022 | | | Gross Carrying | | Accumulated | | Net Carrying | | | Amount | | Amortization | | Amount | Patents | | $ | 28,179 | | $ | (9,724) | | $ | 18,455 | Distribution agreements | | | 3,250 | | | (2,664) | | | 586 | License agreements | | | 11,029 | | | (6,967) | | | 4,062 | Trademarks | | | 30,194 | | | (17,189) | | | 13,005 | Customer lists | | | 34,481 | | | (31,764) | | | 2,717 | Total | | $ | 107,133 | | $ | (68,308) | | $ | 38,825 |
| | | | | | | | | | | | December 31, 2021 | | | Gross Carrying | | Accumulated | | Net Carrying | | | Amount | | Amortization | | Amount | Patents | | $ | 26,349 | | $ | (8,315) | | $ | 18,034 | Distribution agreements | | | 3,250 | | | (2,519) | | | 731 | License agreements | | | 12,663 | | | (7,768) | | | 4,895 | Trademarks | | | 30,242 | | | (15,256) | | | 14,986 | Customer lists | | | 34,985 | | | (31,195) | | | 3,790 | Total | | $ | 107,489 | | $ | (65,053) | | $ | 42,436 |
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| Estimated amortization expense |
Estimated amortization expense for developed technology and other intangible assets for the next five years consisted of the following as of September 30, 2022 (in thousands): | | | | Year Ending December 31, | | Estimated Amortization Expense | Remaining 2022 | | $ | 12,121 | 2023 | | | 47,414 | 2024 | | | 44,330 | 2025 | | | 42,434 | 2026 | | | 31,860 |
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