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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The change in the carrying amount of goodwill for the nine months ended September 30, 2018 is summarized as follows:
|  | Performance Materials & Chemicals |  | Environmental Catalysts & Services |  | Total
Balance as of December 31, 2017 |  | $ | 914,623 |  |  | $ | 391,333 |  |  | $ | 1,305,956 |
Goodwill recognized |  | 649 |  |  | — |  |  | 649 |
Goodwill adjustments(1) |  | (34,811 | ) |  | — |  |  | (34,811 | )
Foreign exchange impact |  | (7,816 | ) |  | (999 | ) |  | (8,815 | )
Balance as of September 30, 2018 |  | $ | 872,645 |  |  | $ | 390,334 |  |  | $ | 1,262,979 |
(1) | Represents the measurement period adjustments on the net assets acquired as part of the Acquisition (see Note 6 to these condensed consolidated financial statements for further information regarding the Acquisition).

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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