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Goodwill and Intangible Assets, Net, Goodwill (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Carrying amount of goodwill by reportable segment |  |  |
Goodwill | $ 136,398 | $ 137,140 | $ 137,160
North America |  |  |
Carrying amount of goodwill by reportable segment |  |  |
Goodwill | 95,621 | 95,755 | 95,659
Europe |  |  |
Carrying amount of goodwill by reportable segment |  |  |
Goodwill | 39,365 | 39,896 | 40,036
Asia/Pacific |  |  |
Carrying amount of goodwill by reportable segment |  |  |
Goodwill | $ 1,412 | $ 1,489 | $ 1,465

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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