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Business Combination Business Combination, Intangible Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 16,770,000 |  |
Noncompete Agreements [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 1,810,000 |  |
Finite-Lived Intangible Asset, Useful Life | 5 years | 5 years |
Trademarks [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 1,610,000 |  |
Finite-Lived Intangible Asset, Useful Life | 10 years | 10 years |
Developed Technology Rights [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 4,420,000 |  |
Finite-Lived Intangible Asset, Useful Life | 7 years | 7 years |
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 8,930,000 |  |
Horizon Plastics [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 16,770,000
Horizon Plastics [Member] | Noncompete Agreements [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Horizon Plastics [Member] | Trademarks [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Horizon Plastics [Member] | Developed Technology Rights [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |
Horizon Plastics [Member] | Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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