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Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 810,332 | $ 838,764 |
Acquisitions | 3,175 | 0 |
Currency translation | 85,550 | (28,432) |
Accumulated amortization | 651,498 | 555,873 |
Net Value | 247,559 | 254,459 | $ 304,192
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 569,980 | 588,716 |
Acquisitions | 3,175 | 0 |
Currency translation | 52,108 | (18,736) |
Accumulated amortization | 390,428 | 334,276 |
Net Value | 234,835 | 235,704 | 271,123
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 234,022 | 243,258 |
Acquisitions | 0 | 0 |
Currency translation | 32,947 | (9,236) |
Accumulated amortization | 259,908 | 220,598 |
Net Value | 7,061 | 13,424 | $ 26,985
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,330 | 6,790 |
Acquisitions | 0 | 0 |
Currency translation | 495 | (460) |
Accumulated amortization | 1,162 | 999 |
Net Value | $ 5,663 | $ 5,331 |

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