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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents the changes in the carrying amount of goodwill for the three months ended March 31, 2025. The carrying amount of goodwill was $9.0 million as of March 31, 2024, and there were no changes in the carrying amount of goodwill during the three months ended March 31, 2024.
| March 31, 2025
| Industrial Operations |  | Energy Operations |  | Manufacturing Operations |  | Total
| (In thousands)
Beginning balance | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 20,349 |  |  | $ | 29,339 |
Effect of foreign currency translation | — |  |  | — |  |  | 56 |  |  | 56 |
Measurement period adjustments | — |  |  | — |  |  | (3,829) |  |  | (3,829) |
Ending balance | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 16,576 |  |  | $ | 25,566 |
Schedule of Finite-Lived Intangible Assets | Other intangible assets, net consisted of the following:
| March 31, 2025
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (In thousands)
Patents: |  |  |  |  |  |  |
Intellectual property operations | 5 years |  | $ | 366,402 |  |  | $ | (336,730) |  |  | $ | 29,672 |
Industrial operations | 7 years |  | 3,400 |  |  | (1,691) |  |  | 1,709 |
Total patents |  |  | 369,802 |  |  | (338,421) |  |  | 31,381 |
Customer relationships: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 5,300 |  |  | (2,634) |  |  | 2,666 |
Manufacturing operations | 15 years |  | 22,400 |  |  | (667) |  |  | 21,733 |
Total customer relationships |  |  | 27,700 |  |  | (3,301) |  |  | 24,399 |
Trade name and trademarks: |  |  |  |  |  |  |
Industrial operations | 7 years |  | 3,430 |  |  | (1,707) |  |  | 1,723 |
Manufacturing operations | 10 years |  | 400 |  |  | (18) |  |  | 382 |
Manufacturing operations | Indefinite |  | 8,546 |  |  | — |  |  | 8,546 |
Total trade name and trademarks |  |  | 12,376 |  |  | (1,725) |  |  | 10,651 |
Developed technology - manufacturing operations | 10 years |  | 1,000 |  |  | (45) |  |  | 955 |
Favorable leases - manufacturing operations | 1.9 years |  | 704 |  |  | (351) |  |  | 353 |
Total |  |  | $ | 411,582 |  |  | $ | (343,843) |  |  | $ | 67,739 |
| 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 | $ | 18,853 |
2026 | 11,175 |
2027 | 8,736 |
2028 | 4,586 |
2029 | 2,003 |
2030 | 2,003 |
Thereafter | 11,837 |
Total | $ | 59,193 |

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