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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | The following table sets forth the gross carrying value, accumulated amortization and net values of intangible assets and goodwill as of September 30, 2025 and December 31, 2024:
| September 30, 2025
(in thousands) | Amortization life in years | Gross carrying amount | Accumulated amortization and other | Net carrying amount
Finite-lived assets: |  |  |  |
AEC Trademarks and trade names | 6-15 | $ | 208 |  | $ | (205) |  | $ | 3 |
AEC Technology | 10-15 | 6,528 |  | (3,962) |  | 2,566 |
AEC Intellectual property | 15 | 1,250 |  | (485) |  | 765 |
AEC Customer relationships | 8-15 | 69,559 |  | (50,069) |  | 19,490 |
Heimbach Developed technology | 9 | 9,281 |  | (2,461) |  | 6,820 |
Total Finite-lived intangible assets |  | $ | 86,826 |  | $ | (57,182) |  | $ | 29,644 |
Indefinite-lived intangible assets: |  |  |  |
Heimbach Trade name |  | $ | 6,454 |  | $ | — |  | $ | 6,454 |
MC Goodwill |  | 69,871 |  | — |  | 69,871 |
AEC Goodwill |  | 114,420 |  | — |  | 114,420 |
Total Indefinite-lived intangible assets: |  | $ | 190,745 |  | $ | — |  | $ | 190,745 |
| December 31, 2024
(in thousands) | Amortization life in years | Gross carrying amount | Accumulated amortization and other | Net carrying amount
Finite-lived assets: |  |  |  |
AEC Trademarks and trade names | 6-15 | $ | 208 |  | $ | (197) |  | $ | 11 |
AEC Technology | 10-15 | 5,820 |  | (3,140) |  | 2,680 |
AEC Intellectual property | 15 | 1,250 |  | (422) |  | 828 |
AEC Customer relationships | 8-15 | 69,175 |  | (47,283) |  | 21,892 |
Heimbach Developed technology | 9 | 8,547 |  | (1,543) |  | 7,004 |
Total Finite-lived assets |  | $ | 85,000 |  | $ | (52,585) |  | $ | 32,415 |
Indefinite-lived intangible assets: |  |  |  |
Heimbach Trade name |  | $ | 5,712 |  | $ | — |  | $ | 5,712 |
MC Goodwill |  | 63,988 |  | — |  | 63,988 |
AEC Goodwill |  | 112,273 |  | — |  | 112,273 |
Total Indefinite-lived intangible assets: |  | $ | 181,973 |  | $ | — |  | $ | 181,973 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The changes in intangible assets, net and goodwill from December 31, 2024 to September 30, 2025, were as follows:
(in thousands) | December 31, 2024 | Other Changes | Amortization | Currency Translation | September 30, 2025
Finite-lived intangible assets: |  |  |  |  |
AEC Trademarks and trade names | $ | 11 |  | $ | — |  | $ | (8) |  | $ | — |  | $ | 3 |
AEC Technology | 2,680 |  | — |  | (462) |  | 348 |  | 2,566 |
AEC Intellectual property | 828 |  | — |  | (63) |  | — |  | 765 |
AEC Customer relationships | 21,892 |  | — |  | (2,626) |  | 224 |  | 19,490 |
Heimbach Developed technology | 7,004 |  | (315) |  | (741) |  | 872 |  | 6,820 |
Total Finite-lived intangible assets | $ | 32,415 |  | $ | (315) |  | $ | (3,900) |  | $ | 1,444 |  | $ | 29,644 |
Indefinite-lived intangible assets: |  |  |  |  |
Heimbach Trade name | $ | 5,712 |  | $ | — |  | $ | — |  | $ | 742 |  | $ | 6,454 |
MC Goodwill | 63,988 |  | — |  | — |  | 5,883 |  | 69,871 |
AEC Goodwill | 112,273 |  | — |  | — |  | 2,147 |  | 114,420 |
Total Indefinite-lived assets: | $ | 181,973 |  | $ | — |  | $ | — |  | $ | 8,772 |  | $ | 190,745 |

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