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Goodwill | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
| Energy Chemistry Technologies |  | Consumer and Industrial Chemistry Technologies |  | Total
Balance at December 31, 2017 | $ | 37,180 |  |  | $ | 19,480 |  |  | $ | 56,660 |
Goodwill impairment recognized | — |  |  | — |  |  | — |
Balance at March 31, 2018 | $ | 37,180 |  |  | $ | 19,480 |  |  | $ | 56,660 |
During the three months ended March 31, 2018 and 2017, no impairments of goodwill were recognized.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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