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Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 912,031 | $ 899,057 |
Acquisitions | 2,092 | 47,368 |
Currency translation | (13,186) | (34,394) |
Accumulated amortization | 674,790 | 657,601 |
Net Value | 226,147 | 254,430 | $ 247,559
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 651,014 | 625,263 |
Acquisitions | 2,092 | 47,361 |
Currency translation | (7,900) | (21,610) |
Accumulated amortization | 426,765 | 406,386 |
Net Value | 218,441 | 244,628 | 234,835
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 254,483 | 266,969 |
Acquisitions | 0 | 0 |
Currency translation | (5,383) | (12,486) |
Accumulated amortization | 246,872 | 249,988 |
Net Value | 2,228 | 4,495 | $ 7,061
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,534 | 6,825 |
Acquisitions | 0 | 7 |
Currency translation | 97 | (298) |
Accumulated amortization | 1,153 | 1,227 |
Net Value | $ 5,478 | $ 5,307 |

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