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Acquisitions (Narrative) (Details) - USD ($) |  |  |  |  | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 28, 2018 | Jul. 06, 2018 | Jan. 06, 2017 | Nov. 23, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 6 years 7 months 2 days |  |
Amortization expense |  |  |  |  |  |  | $ 16,500,000 | $ 14,800,000 | $ 11,200,000
Estimated future amortization expense for 2019 |  |  |  |  | $ 17,700,000 |  | 17,700,000 |  |
Estimated future amortization expense for 2020 |  |  |  |  | 14,600,000 |  | 14,600,000 |  |
Estimated future amortization expense for 2021 |  |  |  |  | 13,800,000 |  | 13,800,000 |  |
Estimated future amortization expense for 2022 |  |  |  |  | 13,300,000 |  | 13,300,000 |  |
Estimated future amortization expense for 2023 |  |  |  |  | 12,700,000 |  | $ 12,700,000 |  |
Asset acquisition, consideration transferred | $ 43,434,000 |  |  |  |  |  |  |  |
Lease, cost | 45,800,000 |  |  |  |  |  |  |  |
Finance lease, principal payments | 2,000,000 |  |  |  |  |  |  |  |
Asset acquisition, transaction costs | $ 400,000 |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 7 years 6 months 19 days |  |
Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 4 years 4 months 7 days |  |
Covenants not to compete |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 2 years 1 month 6 days |  |
Griswold |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interests acquired |  | 100.00% |  |  |  |  |  |  |
Purchase price |  | $ 78,000,000 |  |  |  |  |  |  |
Cash from credit facility used to fund acquisition |  | 82,500,000 |  |  |  |  |  |  |
Earn out payment |  | 3,000,000 |  |  |  |  |  |  |
Actual earn out payment |  | 0 |  |  |  |  |  |  |
Estimated future amortization expense for 2020 |  |  |  |  |  | $ 2,800,000 |  |  |
Estimated future amortization expense for 2021 |  |  |  |  |  | 3,000,000 |  |  |
Estimated future amortization expense for 2022 |  |  |  |  |  | 2,800,000 |  |  |
Estimated future amortization expense for 2023 |  |  |  |  | 2,500,000 | $ 2,700,000 | $ 2,500,000 |  |
Business acquisition, acquiree revenue |  |  |  |  | 13,700,000 |  |  |  |
Griswold | Customer relationships |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | 22,100,000 |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 9 years 6 months |  |
Griswold | Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | 9,600,000 |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 3 years 6 months |  |
Griswold | Trademarks |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | 1,800,000 |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 10 years 4 months 24 days |  |
Griswold | Covenants not to compete |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 600,000 |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  | 3 years 2 months |  |  |
Diversified Silicone Products, Inc. |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 60,200,000 |  |  |  |  |  |
Cash from credit facility used to fund acquisition |  |  | 30,000,000 |  |  |  |  |  |
Estimated future amortization expense for 2019 |  |  |  |  | 1,800,000 |  | $ 1,800,000 |  |
Estimated future amortization expense for 2020 |  |  |  |  | 1,800,000 |  | 1,800,000 |  |
Estimated future amortization expense for 2021 |  |  |  |  | 1,800,000 |  | 1,800,000 |  |
Estimated future amortization expense for 2022 |  |  |  |  | 1,700,000 |  | 1,700,000 |  |
Estimated future amortization expense for 2023 |  |  |  |  | 1,700,000 |  | $ 1,700,000 |  |
Transaction costs |  |  |  |  |  |  |  | 500,000 |
Business acquisition, acquiree revenue |  |  |  |  |  |  |  | $ 22,300,000 |
Diversified Silicone Products, Inc. | Customer relationships |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | 30,500,000 |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 11 years 9 months 18 days |  |
Diversified Silicone Products, Inc. | Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | 1,800,000 |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 4 years 3 months 18 days |  |
Diversified Silicone Products, Inc. | Trademarks |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | 3,300,000 |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 11 years 8 months 12 days |  |
Diversified Silicone Products, Inc. | Covenants not to compete |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 300,000 |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 4 years 1 month 6 days |  |
DeWAL |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 135,500,000 |  |  |  |  |
Cash from credit facility used to fund acquisition |  |  |  | 136,000,000 |  |  |  |  |
Estimated future amortization expense for 2019 |  |  |  |  | 4,100,000 |  | $ 4,100,000 |  |
Estimated future amortization expense for 2020 |  |  |  |  | 4,300,000 |  | 4,300,000 |  |
Estimated future amortization expense for 2021 |  |  |  |  | 4,300,000 |  | 4,300,000 |  |
Estimated future amortization expense for 2022 |  |  |  |  | 4,300,000 |  | 4,300,000 |  |
Estimated future amortization expense for 2023 |  |  |  |  | $ 4,300,000 |  | $ 4,300,000 |  |
Transaction costs |  |  |  |  |  |  |  |  | 2,100,000
Business acquisition, acquiree revenue |  |  |  |  |  |  |  |  | $ 5,400,000
DeWAL | Customer relationships |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 46,700,000 |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 13 years 6 months |  |
DeWAL | Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 22,000,000 |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 8 years 7 months 6 days |  |
DeWAL | Trademarks |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 4,300,000 |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 5 years 2 months 12 days |  |
DeWAL | Covenants not to compete |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 500,000 |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 3 years 9 months 18 days |  |
Minimum | Griswold |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | $ 700,000 |  |
Minimum | Diversified Silicone Products, Inc. |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | 1,100,000 |  |
Minimum | DeWAL |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | 2,400,000 |  |
Maximum | Griswold |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | 3,000,000 |  |
Maximum | Diversified Silicone Products, Inc. |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | 2,000,000 |  |
Maximum | DeWAL |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | 4,300,000 |  |
Selling, General and Administrative Expenses | Griswold |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  | $ 1,100,000 |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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