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Operations and Summary of Significant Accounting Policies - Intangible Assets Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Indefinite-Lived Intangible Assets |  |  |
Amortization of Intangible Assets | $ 6,200 | $ 6,000 | $ 6,100
Finite-Lived Intangible Assets, Gross | 54,537 | 51,442 |
Finite-Lived Intangible Assets, Accumulated Amortization | (25,211) | (28,578) |
Intangible Assets, Net (Excluding Goodwill) | 29,326 | 22,864 |
North America |  |  |
Indefinite-Lived Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 30,775 | 23,562 |
Finite-Lived Intangible Assets, Accumulated Amortization | (13,732) | (13,811) |
Intangible Assets, Net (Excluding Goodwill) | 17,043 | 9,751 |
Europe |  |  |
Indefinite-Lived Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 23,762 | 27,880 |
Finite-Lived Intangible Assets, Accumulated Amortization | (11,479) | (14,767) |
Intangible Assets, Net (Excluding Goodwill) | 12,283 | 13,113 |
Customer Relationships |  |  |
Indefinite-Lived Intangible Assets |  |  |
Reclassifications | (626) | 46 |
Amortization of Intangible Assets | 1,574 | 1,793 |
Finite-Lived Intangible Assets, Gross | 17,678 | 21,217 | 21,242
Finite-Lived Intangible Assets, Accumulated Amortization | (10,869) | (14,945) | (13,152)
Intangible Assets, Net (Excluding Goodwill) | 6,809 | 6,272 | 8,090
Patents |  |  |
Indefinite-Lived Intangible Assets |  |  |
Reclassifications |  | 212 |
Amortization of Intangible Assets | 187 | 149 |
Finite-Lived Intangible Assets, Gross | 2,350 | 1,718 | 1,513
Finite-Lived Intangible Assets, Accumulated Amortization | (545) | (528) | (379)
Intangible Assets, Net (Excluding Goodwill) | 1,805 | 1,190 | 1,134
Noncompete Agreements Trademarks and Other |  |  |
Indefinite-Lived Intangible Assets |  |  |
Reclassifications |  | 119 |
Amortization of Intangible Assets | 2,495 | 2,040 |
Finite-Lived Intangible Assets, Gross | 12,225 | 6,727 | 10,578
Finite-Lived Intangible Assets, Accumulated Amortization | (2,817) | (4,100) | (7,203)
Intangible Assets, Net (Excluding Goodwill) | 9,408 | 2,627 | 3,375
Unpatented Technology |  |  |
Indefinite-Lived Intangible Assets |  |  |
Reclassifications |  | 1,512 |
Amortization of Intangible Assets | 1,976 | 2,058 |
Finite-Lived Intangible Assets, Gross | 21,667 | 21,162 | 21,604
Finite-Lived Intangible Assets, Accumulated Amortization | (10,979) | (9,003) | (8,656)
Intangible Assets, Net (Excluding Goodwill) | 10,688 | $ 12,159 | $ 12,948
Trade Name |  |  |
Indefinite-Lived Intangible Assets |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 600 |  |

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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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