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Acquisitions and Divestitures - Divestitures (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income tax expense |  | $ 26,889,000 |  | $ 30,019,000 | $ 87,678,000 | $ 88,160,000
Faure Herman subsidiary | Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of business | $ 21,800,000 |  |  |  |  |
Gain on sale of businesses - net |  |  | $ 9,300,000 |  |  |
Income tax expense |  |  | $ 0 |  |  |

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