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Acquisitions - Preliminary Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2017 | Dec. 31, 2016 | Sep. 19, 2016
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 413,640 | $ 422,185 |  | $ 333,276 |
Senscient, Incorporated |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets |  |  |  |  | $ 5,900
Cash included in current assets |  |  |  |  | 700
Property, plant and equipment |  |  |  |  | 300
Goodwill |  |  |  |  | 10,500
Total assets acquired |  |  |  |  | 21,100
Total liabilities assumed |  |  |  |  | 2,000
Net assets acquired |  |  |  |  | 19,100
Globe Holding Company LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets |  |  | $ 28,600 |  |
Cash included in current assets |  |  | 58 |  |
Property, plant and equipment |  |  | 8,300 |  |
Goodwill |  |  | 74,500 |  |
Total assets acquired |  |  | 222,100 |  |
Total liabilities assumed |  |  | 5,700 |  |
Net assets acquired |  |  | 216,400 |  |
Customer-related intangibles | Globe Holding Company LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets |  |  | 40,200 |  |
Acquired technology | Senscient, Incorporated |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets |  |  |  |  | 1,600
Acquired technology | Globe Holding Company LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets |  |  | 10,500 |  |
Customer relationships | Senscient, Incorporated |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets |  |  |  |  | $ 2,800
Trade Names | Globe Holding Company LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible assets |  |  | $ 60,000 |  |

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