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Goodwill | 9 Months Ended
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Sep. 30, 2016
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 |  | Teledrift |  | Production Technologies |  | Total
Balance at December 31, 2015 | $ | 36,318 |  |  | $ | 19,480 |  |  | $ | 15,333 |  |  | $ | 1,689 |  |  | $ | 72,820 |
Addition upon acquisition of IPI | 862 |  |  | — |  |  | — |  |  | — |  |  | 862 |
Balance at September 30, 2016 | $ | 37,180 |  |  | $ | 19,480 |  |  | $ | 15,333 |  |  | $ | 1,689 |  |  | $ | 73,682 |
Goodwill within the Teledrift and Production Technologies reporting units was tested for impairment during the three months ended March 31, 2016, June 30, 2016, and September 30, 2016. No impairments of goodwill were recognized during the three and nine months ended September 30, 2016 and 2015 (see Note 3).

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