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Goodwill and Other Intangibles (Tables) | 6 Months Ended
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Jun. 30, 2024
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, 2024 (in thousands):
| Energy Storage |  | Specialties |  | Ketjen |  |  |  | Total
Balance at December 31, 2023(a) | $ | 1,424,484 |  |  | $ | 32,639 |  |  | $ | 172,606 |  |  |  |  | $ | 1,629,729 |
Foreign currency translation adjustments | (22,719) |  |  | (51) |  |  | (6,021) |  |  |  |  | (28,791) |
Balance at June 30, 2024(a) | $ | 1,401,765 |  |  | $ | 32,588 |  |  | $ | 166,585 |  |  |  |  | $ | 1,600,938 |
(a) Balance at June 30, 2024 and December 31, 2023 includes an accumulated impairment loss of $6.8 million in Ketjen. As a result, the balance of Ketjen at June 30, 2024 and December 31, 2023 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, 2024 (in thousands):
| Customer Lists and Relationships |  | Trade Names and Trademarks(a) |  | Patents and Technology |  | Other |  | Total
Gross Asset Value |  |  |  |  |  |  |  |  |
Balance at December 31, 2023 | $ | 417,803 |  |  | $ | 13,405 |  |  | $ | 46,287 |  |  | $ | 34,649 |  |  | $ | 512,144 |
Retirements | — |  |  | (2,309) |  |  | (14,506) |  |  | (4,409) |  |  | (21,224) |
Foreign currency translation adjustments and other | (11,338) |  |  | (264) |  |  | (745) |  |  | (769) |  |  | (13,116) |
Balance at June 30, 2024 | $ | 406,465 |  |  | $ | 10,832 |  |  | $ | 31,036 |  |  | $ | 29,471 |  |  | $ | 477,804 |
Accumulated Amortization |  |  |  |  |  |  |  |  |
Balance at December 31, 2023 | $ | (204,481) |  |  | $ | (3,673) |  |  | $ | (26,758) |  |  | $ | (15,374) |  |  | $ | (250,286) |
Amortization | (9,877) |  |  | — |  |  | (1,276) |  |  | (452) |  |  | (11,605) |
Retirements | — |  |  | 2,309 |  |  | 14,506 |  |  | 4,409 |  |  | 21,224 |
Foreign currency translation adjustments and other | 5,409 |  |  | 40 |  |  | 453 |  |  | 296 |  |  | 6,198 |
Balance at June 30, 2024 | $ | (208,949) |  |  | $ | (1,324) |  |  | $ | (13,075) |  |  | $ | (11,121) |  |  | $ | (234,469) |
Net Book Value at December 31, 2023 | $ | 213,322 |  |  | $ | 9,732 |  |  | $ | 19,529 |  |  | $ | 19,275 |  |  | $ | 261,858 |
Net Book Value at June 30, 2024 | $ | 197,516 |  |  | $ | 9,508 |  |  | $ | 17,961 |  |  | $ | 18,350 |  |  | $ | 243,335 |
(a) Net Book Value includes only indefinite-lived intangible assets.

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