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Goodwill and Other Intangible Assets - Net Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 980,310 | $ 900,937 |
Acquisitions | 22,817 | 12,789 |
Currency translation | (59,828) | 66,584 |
Accumulated amortization | 738,224 | 755,971 |
Net Value | 205,075 | 224,339 | $ 226,147
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 699,795 | 645,206 |
Acquisitions | 18,189 | 12,789 |
Currency translation | (37,807) | 41,800 |
Accumulated amortization | 483,748 | 481,256 |
Net Value | 196,429 | 218,539 | 218,441
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 273,570 | 249,100 |
Acquisitions | 4,628 | 0 |
Currency translation | (21,862) | 24,470 |
Accumulated amortization | 252,414 | 273,426 |
Net Value | 3,922 | 144 | $ 2,228
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,945 | 6,631 |
Acquisitions | 0 | 0 |
Currency translation | (159) | 314 |
Accumulated amortization | 2,062 | 1,289 |
Net Value | $ 4,724 | $ 5,656 |

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