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Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Intangible Assets, Net: |  |  |
Cost | $ 626,713 | $ 672,949 |
Acquisitions | 264,165 | 0 |
Currency translation | (52,114) | (6,968) |
Accumulated amortization | 534,572 | 586,663 |
Net Value | 304,192 | 79,318 | $ 111,010
Customer Relationships [Member] |  |  |
Intangible Assets, Net: |  |  |
Cost | 354,768 | 373,117 |
Acquisitions | 258,875 | 0 |
Currency translation | (24,927) | (180) |
Accumulated amortization | 317,593 | 339,020 |
Net Value | 271,123 | 33,917 | 40,998
Patents [Member] |  |  |
Intangible Assets, Net: |  |  |
Cost | 270,466 | 297,999 |
Acquisitions | 0 | 0 |
Currency translation | (27,208) | (6,780) |
Accumulated amortization | 216,273 | 246,628 |
Net Value | 26,985 | 44,591 | $ 69,071
Other [Member] |  |  |
Intangible Assets, Net: |  |  |
Cost | 1,479 | 1,833 |
Acquisitions | 5,290 | 0 |
Currency translation | 21 | (8) |
Accumulated amortization | 706 | 1,015 |
Net Value | $ 6,084 | $ 810 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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