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Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 899,057 | $ 810,332 |
Acquisitions | 47,368 | 3,175 |
Currency translation | (34,394) | 85,550 |
Accumulated amortization | 657,601 | 651,498 |
Net Value | 254,430 | 247,559 | $ 254,459
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 625,263 | 569,980 |
Acquisitions | 47,361 | 3,175 |
Currency translation | (21,610) | 52,108 |
Accumulated amortization | 406,386 | 390,428 |
Net Value | 244,628 | 234,835 | 235,704
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 266,969 | 234,022 |
Acquisitions | 0 | 0 |
Currency translation | (12,486) | 32,947 |
Accumulated amortization | 249,988 | 259,908 |
Net Value | 4,495 | 7,061 | $ 13,424
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,825 | 6,330 |
Acquisitions | 7 | 0 |
Currency translation | (298) | 495 |
Accumulated amortization | 1,227 | 1,162 |
Net Value | $ 5,307 | $ 5,663 |

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