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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 11, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Intangible assets, Accumulated amortization |  | $ (198,093) |  | $ (190,742)
Intangible assets, Gross carrying amount |  | 745,118 |  | 603,935
Amortization expense |  | 7,400 | $ 5,500 |
Future amortization expense [Abstract] |  |  |  |
Remaining, 2019 |  | 25,264 |  |
2020 |  | 33,890 |  |
2021 |  | 33,099 |  |
2022 |  | 31,849 |  |
2023 |  | 31,061 |  |
2024 |  | 30,358 |  |
Amortization included in expense |  |  |  |
Future amortization expense [Abstract] |  |  |  |
Remaining, 2019 |  | 20,764 |  |
2020 |  | 27,890 |  |
2021 |  | 27,099 |  |
2022 |  | 25,849 |  |
2023 |  | 25,061 |  |
2024 |  | 24,358 |  |
Amortization recorded as a reduction of revenue |  |  |  |
Future amortization expense [Abstract] |  |  |  |
Remaining, 2019 |  | 4,500 |  |
2020 |  | 6,000 |  |
2021 |  | 6,000 |  |
2022 |  | 6,000 |  |
2023 |  | 6,000 |  |
2024 |  | 6,000 |  |
Trademarks & tradenames |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Unamortized intangible assets, Gross carrying amount |  | 86,544 |  | 86,544
Customer and distributor relationships |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Amortized intangible assets, Gross carrying amount |  | 339,529 |  | 214,577
Intangible assets, Accumulated amortization |  | (101,057) |  | (97,131)
Sales representation, marketing and promotional rights |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Amortized intangible assets, Gross carrying amount |  | 149,376 |  | 149,376
Intangible assets, Accumulated amortization |  | (43,500) |  | (42,000)
Patents and other intangible assets |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Amortized intangible assets, Gross carrying amount |  | 68,704 |  | 61,473
Intangible assets, Accumulated amortization |  | (44,783) |  | (44,242)
Developed technology |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Amortized intangible assets, Gross carrying amount |  | 100,965 |  | 91,965
Intangible assets, Accumulated amortization |  | (8,753) |  | $ (7,369)
Future amortization expense [Abstract] |  |  |  |
Asset Acquisition, Contingent Consideration Liability |  | $ 5,500 |  |
Weighted Average |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life (in years) |  | 22 years |  |
Weighted Average | Customer and distributor relationships |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life (in years) |  | 24 years |  |
Weighted Average | Sales representation, marketing and promotional rights |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life (in years) |  | 25 years |  |
Weighted Average | Patents and other intangible assets |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life (in years) |  | 15 years |  |
Weighted Average | Developed technology |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life (in years) |  | 15 years |  |
Buffalo Filter LLC |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Weighted average amortization period (in years) | 16 years |  |  |
Buffalo Filter LLC | Customer and distributor relationships |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Weighted average amortization period (in years) | 16 years |  |  |
Buffalo Filter LLC | Developed technology |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items] |  |  |  |
Finite-lived intangible assets acquired | $ 141,000 |  |  |
Weighted average amortization period (in years) | 10 years |  |  |

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