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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying value of goodwill | Changes in the carrying amount of goodwill for each reporting unit are as follows (in thousands):
| Energy Chemistry Technologies |  | Consumer and Industrial Chemistry Technologies |  | Total
Balance at December 31, 2015: |  |  |  |  |
Goodwill | $ | 36,318 |  |  | $ | 19,480 |  |  | $ | 55,798 |
Accumulated impairment losses | — |  |  | — |  |  | — |
Goodwill balance, net | 36,318 |  |  | 19,480 |  |  | 55,798 |
Activity during the year 2016: |  |  |  |  |
Goodwill impairment recognized | — |  |  | — |  |  | — |
Acquisition goodwill recognized | 862 |  |  | — |  |  | 862 |
Balance at December 31, 2016: |  |  |  |  |
Goodwill | 37,180 |  |  | 19,480 |  |  | 56,660 |
Accumulated impairment losses | — |  |  | — |  |  | — |
Goodwill balance, net | 37,180 |  |  | 19,480 |  |  | 56,660 |
Activity during the year 2017: |  |  |  |  |
Goodwill impairment recognized | — |  |  | — |  |  | — |
Acquisition goodwill recognized | — |  |  | — |  |  | — |
Balance at December 31, 2017: |  |  |  |  |
Goodwill | 37,180 |  |  | 19,480 |  |  | 56,660 |
Accumulated impairment losses | — |  |  | — |  |  | — |
Goodwill balance, net | $ | 37,180 |  |  | $ | 19,480 |  |  | $ | 56,660 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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