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Goodwill and Other Intangibles | 3 Months Ended
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Mar. 31, 2024
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 three-month period ended March 31, 2024 (in thousands):
| Energy Storage |  | Specialties |  | Ketjen |  |  |  | Total
Balance at December 31, 2023 | $ | 1,424,484 |  |  | $ | 32,639 |  |  | $ | 172,606 |  |  |  |  | $ | 1,629,729 |
Foreign currency translation adjustments and other | (12,950) |  |  | (28) |  |  | (3,217) |  |  |  |  | (16,195) |
Balance at March 31, 2024 | $ | 1,411,534 |  |  | $ | 32,611 |  |  | $ | 169,389 |  |  |  |  | $ | 1,613,534 |
The following table summarizes the changes in other intangibles and related accumulated amortization for the three-month period ended March 31, 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 | (6,236) |  |  | (227) |  |  | (519) |  |  | (927) |  |  | (7,909) |
Balance at March 31, 2024 | $ | 411,567 |  |  | $ | 10,869 |  |  | $ | 31,262 |  |  | $ | 29,313 |  |  | $ | 483,011 |
Accumulated Amortization |  |  |  |  |  |  |  |  |
Balance at December 31, 2023 | $ | (204,481) |  |  | $ | (3,673) |  |  | $ | (26,758) |  |  | $ | (15,374) |  |  | $ | (250,286) |
Amortization | (5,012) |  |  | — |  |  | (647) |  |  | (227) |  |  | (5,886) |
Retirements | — |  |  | 2,309 |  |  | 14,506 |  |  | 4,409 |  |  | 21,224 |
Foreign currency translation adjustments and other | 2,956 |  |  | 40 |  |  | 360 |  |  | 336 |  |  | 3,692 |
Balance at March 31, 2024 | $ | (206,537) |  |  | $ | (1,324) |  |  | $ | (12,539) |  |  | $ | (10,856) |  |  | $ | (231,256) |
Net Book Value at December 31, 2023 | $ | 213,322 |  |  | $ | 9,732 |  |  | $ | 19,529 |  |  | $ | 19,275 |  |  | $ | 261,858 |
Net Book Value at March 31, 2024 | $ | 205,030 |  |  | $ | 9,545 |  |  | $ | 18,723 |  |  | $ | 18,457 |  |  | $ | 251,755 |
(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://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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