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Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 838,764 | $ 626,713 |
Acquisitions | 0 | 264,165 |
Currency translation | (28,432) | (52,114) |
Accumulated amortization | 555,873 | 534,572 |
Net Value | 254,459 | 304,192 | $ 79,318
Customer relationships |  |  |
Intangible Assets, Net: |  |  |
Cost | 588,716 | 354,768 |
Acquisitions | 0 | 258,875 |
Currency translation | (18,736) | (24,927) |
Accumulated amortization | 334,276 | 317,593 |
Net Value | 235,704 | 271,123 | 33,917
Patents |  |  |
Intangible Assets, Net: |  |  |
Cost | 243,258 | 270,466 |
Acquisitions | 0 | 0 |
Currency translation | (9,236) | (27,208) |
Accumulated amortization | 220,598 | 216,273 |
Net Value | 13,424 | 26,985 | $ 44,591
Other |  |  |
Intangible Assets, Net: |  |  |
Cost | 6,790 | 1,479 |
Acquisitions | 0 | 5,290 |
Currency translation | (460) | 21 |
Accumulated amortization | 999 | 706 |
Net Value | $ 5,331 | $ 6,084 |

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