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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Other Than Goodwill | 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.

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