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Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 254,459 | $ 304,192 |
Intangible assets acquired during the year | 3,175 | 0 |
Amortization during the year | (34,279) | (39,545) | $ (29,909)
Currency translation during the year | 24,204 | (10,188) |
Intangible assets subject to amortization, ending balance | 247,559 | 254,459 | 304,192
Customer relationships |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 235,704 | 271,123 |
Intangible assets acquired during the year | 3,175 | 0 |
Amortization during the year | (26,602) | (25,778) |
Currency translation during the year | 22,558 | (9,641) |
Intangible assets subject to amortization, ending balance | 234,835 | 235,704 | 271,123
Patents |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 13,424 | 26,985 |
Intangible assets acquired during the year | 0 | 0 |
Amortization during the year | (7,543) | (13,141) |
Currency translation during the year | 1,180 | (420) |
Intangible assets subject to amortization, ending balance | 7,061 | 13,424 | 26,985
Other |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 5,331 | 6,084 |
Intangible assets acquired during the year | 0 | 0 |
Amortization during the year | (134) | (626) |
Currency translation during the year | 466 | (127) |
Intangible assets subject to amortization, ending balance | $ 5,663 | $ 5,331 | $ 6,084

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after 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=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments and purchase accounting adjustments. + References No definition available. + Details
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