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Goodwill and Other Intangibles (Tables) | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Goodwill | The following table summarizes the changes in goodwill by reportable segment for the six-month period ended June 30, 2025 (in thousands):
| Energy Storage |  | Specialties |  | Ketjen |  |  |  | Total
Balance at December 31, 2024(a) | $ | 1,387,591 |  |  | $ | 32,577 |  |  | $ | 162,546 |  |  |  |  | $ | 1,582,714 |
Foreign currency translation adjustments | 69,475 |  |  | 49 |  |  | 18,689 |  |  |  |  | 88,213 |
Balance at June 30, 2025(a) | $ | 1,457,066 |  |  | $ | 32,626 |  |  | $ | 181,235 |  |  |  |  | $ | 1,670,927 |
(a) Balance at June 30, 2025 and December 31, 2024 includes an accumulated impairment loss of $6.8 million from the Performance Catalyst Solutions reporting unit within the Ketjen segment. As a result, the balance of Ketjen goodwill at June 30, 2025 and December 31, 2024 fully consists of goodwill related to the Refining Solutions reporting unit.
Other Intangibles | The following table summarizes the changes in other intangibles and related accumulated amortization for the six-month period ended June 30, 2025 (in thousands):
| Customer Lists and Relationships |  | Trade Names and Trademarks(a) |  | Patents and Technology |  | Other |  | Total
Gross Asset Value |  |  |  |  |  |  |  |  |
Balance at December 31, 2024 | $ | 402,012 |  |  | $ | 10,670 |  |  | $ | 32,265 |  |  | $ | 29,010 |  |  | $ | 473,957 |
Foreign currency translation adjustments and other | 27,851 |  |  | 620 |  |  | 1,311 |  |  | 915 |  |  | 30,697 |
Balance at June 30, 2025 | $ | 429,863 |  |  | $ | 11,290 |  |  | $ | 33,576 |  |  | $ | 29,925 |  |  | $ | 504,654 |
Accumulated Amortization |  |  |  |  |  |  |  |  |
Balance at December 31, 2024 | $ | (216,231) |  |  | $ | (1,324) |  |  | $ | (14,253) |  |  | $ | (11,396) |  |  | $ | (243,204) |
Amortization | (9,404) |  |  | — |  |  | (1,269) |  |  | (491) |  |  | (11,164) |
Foreign currency translation adjustments and other | (14,712) |  |  | — |  |  | (382) |  |  | (244) |  |  | (15,338) |
Balance at June 30, 2025 | $ | (240,347) |  |  | $ | (1,324) |  |  | $ | (15,904) |  |  | $ | (12,131) |  |  | $ | (269,706) |
Net Book Value at December 31, 2024 | $ | 185,781 |  |  | $ | 9,346 |  |  | $ | 18,012 |  |  | $ | 17,614 |  |  | $ | 230,753 |
Net Book Value at June 30, 2025 | $ | 189,516 |  |  | $ | 9,966 |  |  | $ | 17,672 |  |  | $ | 17,794 |  |  | $ | 234,948 |
(a) Net Book Value includes only indefinite-lived intangible assets.

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