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Goodwill and Intangible Assets, Net, Intangible Assets, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount | $ 54,650 | $ 54,537 | $ 63,353
Accumulated amortization | (29,193) | (25,211) | (33,303)
Net carrying amount | 25,457 | 29,326 | 30,050
North America |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount | 30,715 | 30,775 | 33,923
Accumulated amortization | (15,993) | (13,732) | (16,728)
Net carrying amount | 14,722 | 17,043 | 17,195
Europe |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount | 23,935 | 23,762 | 29,430
Accumulated amortization | (13,200) | (11,479) | (16,575)
Net carrying amount | $ 10,735 | $ 12,283 | $ 12,855

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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