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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 Goodwill | Changes in the carrying amount of goodwill consisted of the following:
| Industrial Operations |  | Energy Operations |  | Manufacturing Operations |  | Total
| (In thousands)
Balance at December 31, 2024 | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 20,349 |  |  | $ | 29,339 |
Effect of foreign currency translation | — |  |  | — |  |  | 185 |  |  | 185 |
Measurement period adjustments | — |  |  | — |  |  | (3,829) |  |  | (3,829) |
Impairment losses | — |  |  | — |  |  | — |  |  | — |
Balance at September 30, 2025 | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 16,705 |  |  | $ | 25,695 |
Schedule of Finite-Lived Intangible Assets | Other intangible assets, net consisted of the following:
| September 30, 2025
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (In thousands)
Patents: |  |  |  |  |  |  |
Intellectual property operations | 5 years |  | $ | 366,402 |  |  | $ | (347,429) |  |  | $ | 18,973 |
Industrial operations | 7 years |  | 3,400 |  |  | (1,933) |  |  | 1,467 |
Total patents |  |  | 369,802 |  |  | (349,362) |  |  | 20,440 |
Customer relationships: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 5,300 |  |  | (3,014) |  |  | 2,286 |
Manufacturing operations | 15 years |  | 22,387 |  |  | (1,384) |  |  | 21,003 |
Total customer relationships |  |  | 27,687 |  |  | (4,398) |  |  | 23,289 |
Trade name and trademarks: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 3,430 |  |  | (1,950) |  |  | 1,480 |
Manufacturing operations | 10 years |  | 398 |  |  | (38) |  |  | 360 |
Manufacturing operations | Indefinite |  | 8,695 |  |  | — |  |  | 8,695 |
Total trade name and trademarks |  |  | 12,523 |  |  | (1,988) |  |  | 10,535 |
Developed technology - manufacturing operations | 10 years |  | 1,000 |  |  | (95) |  |  | 905 |
Favorable leases - manufacturing operations | 1.9 years |  | 703 |  |  | (414) |  |  | 289 |
Total |  |  | $ | 411,715 |  |  | $ | (356,257) |  |  | $ | 55,458 |
| December 31, 2024
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (In thousands)
Patents: |  |  |  |  |  |  |
Intellectual property operations | 6 years |  | $ | 351,403 |  |  | $ | (332,211) |  |  | $ | 19,192 |
Industrial operations | 7 years |  | 3,400 |  |  | (1,568) |  |  | 1,832 |
Total patents |  |  | 354,803 |  |  | (333,779) |  |  | 21,024 |
Customer relationships: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 5,300 |  |  | (2,446) |  |  | 2,854 |
Manufacturing operations | 15 years |  | 20,200 |  |  | (269) |  |  | 19,931 |
Total customer relationships |  |  | 25,500 |  |  | (2,715) |  |  | 22,785 |
Trade name and trademarks: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 3,430 |  |  | (1,583) |  |  | 1,847 |
Manufacturing operations | 10 years |  | 400 |  |  | (8) |  |  | 392 |
Manufacturing operations | Indefinite |  | 8,009 |  |  | — |  |  | 8,009 |
Total trade name and trademarks |  |  | 11,839 |  |  | (1,591) |  |  | 10,248 |
Developed technology - manufacturing operations | 10 years |  | 1,000 |  |  | (20) |  |  | 980 |
Favorable leases - manufacturing operations | 1.9 years |  | 704 |  |  | (312) |  |  | 392 |
Total |  |  | $ | 393,846 |  |  | $ | (338,417) |  |  | $ | 55,429 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table presents the scheduled annual aggregate amortization expense (in thousands):
Years Ending December 31, |
Remainder of 2025 | $ | 6,160 |
2026 | 10,937 |
2027 | 8,478 |
2028 | 4,211 |
2029 | 1,628 |
2030 | 1,628 |
Thereafter | 13,721 |
Total | $ | 46,763 |

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