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Property, Plant and Equipment (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Jun. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciation |  |  |  | $ 33,500 | $ 29,300 | $ 26,600 |  |
Impairment charges |  |  |  | 1,506 | 807 | 0 |  |
Assets held for sale |  |  |  | 0 | 896 |  |  |
Gain on sale of property, plant and equipment |  |  |  | $ 3,087 | $ 5,329 | $ 0 |  |
Property plant and equipment, held for sale |  |  |  |  |  |  | $ 400 |
Arizona |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  | $ 900
Gain on sale of property, plant and equipment | $ 400 |  |  |  |  |  |  |
Belgium |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property, plant and equipment |  | $ 4,400 | $ 900 |  |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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