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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | (10) Intangible Assets Intangible assets, net, other than goodwill, at December 31, 2021 and 2020 are summarized as follows:
| 2021 |  | 2020
(in thousands) | Gross a |  | Accumulated Amortization |  | Net |  | Gross a |  | Accumulated Amortization |  | Net |  | Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 53,062 |  |  | $ | (45,613) |  |  | $ | 7,449 |  |  | $ | 71,123 |  |  | $ | (56,682) |  |  | $ | 14,441 |  |  | 2.8
Acquired technology | 17,518 |  |  | (5,430) |  |  | 12,088 |  |  | 42,472 |  |  | (41,201) |  |  | 1,271 |  |  | 5.2
Trade names | 20,448 |  |  | (10,438) |  |  | 10,010 |  |  | 17,477 |  |  | (16,506) |  |  | 971 |  |  | 18.9
Patent costs | 21,852 |  |  | (11,812) |  |  | 10,040 |  |  | 19,828 |  |  | (10,999) |  |  | 8,829 |  |  | 10.5
Trade secrets | 19,924 |  |  | (18,971) |  |  | 953 |  |  | 20,188 |  |  | (18,216) |  |  | 1,972 |  |  | 1.1
Acquired patents | 16,257 |  |  | (15,945) |  |  | 312 |  |  | 16,317 |  |  | (15,723) |  |  | 594 |  |  | 6.1
Other | 12,982 |  |  | (7,999) |  |  | 4,983 |  |  | 19,793 |  |  | (19,788) |  |  | 5 |  |  | 9.4
Total intangible assets | $ | 162,043 |  |  | $ | (116,208) |  |  | $ | 45,835 |  |  | $ | 207,198 |  |  | $ | (179,115) |  |  | $ | 28,083 |  |  | 8.5
a.Change in gross carrying amounts primarily due to divestitures of Cimatron, Simbionix and ODM partially offset by the acquisition of Oqton and foreign currency translation. Amortization expense related to intangible assets was $10,469, $15,810 and $20,312 for the years ended December 31, 2021 2020 and 2019, respectively. Annual amortization expense for intangible assets is expected to be $10,767 in 2022, $6,190 in 2023, $5,395 in 2024, $5,365 in 2025 and $4,415 in 2026.

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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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