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Goodwill and Other Intangible Assets - Net Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 900,937 | $ 912,031 |
Acquisitions | 12,789 | 2,092 |
Currency translation | 66,584 | (13,186) |
Accumulated amortization | 755,971 | 674,790 |
Net Value | 224,339 | 226,147 | $ 254,430
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 645,206 | 651,014 |
Acquisitions | 12,789 | 2,092 |
Currency translation | 41,800 | (7,900) |
Accumulated amortization | 481,256 | 426,765 |
Net Value | 218,539 | 218,441 | 244,628
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 249,100 | 254,483 |
Acquisitions | 0 | 0 |
Currency translation | 24,470 | (5,383) |
Accumulated amortization | 273,426 | 246,872 |
Net Value | 144 | 2,228 | $ 4,495
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,631 | 6,534 |
Acquisitions | 0 | 0 |
Currency translation | 314 | 97 |
Accumulated amortization | 1,289 | 1,153 |
Net Value | $ 5,656 | $ 5,478 |

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