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Goodwill and Other Intangibles | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangibles | Goodwill and Other Intangibles: 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. As previously discussed in Part II, Item 8 - Note 1, "Summary of Significant Accounting Policies," of the Company's Annual Report on Form 10-K for the year ended December 31, 2024, if revenue or adjusted EBITDA growth are lower than forecasted, or costs are higher than anticipated, the Company may recognize a non-cash goodwill impairment loss in the Refining Solutions reporting unit within the Ketjen segment. 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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