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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill consisted of the following:
| June 30, 2024
| Industrial Operations |  | Energy Operations |  | Total
| (In thousands)
Beginning balance | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 8,990 |
Acquisition of business | — |  |  | — |  |  | — |
Impairment losses | — |  |  | — |  |  | — |
Ending balance | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 8,990 |
| December 31, 2023
| Industrial Operations |  | Energy Operations |  | Total
| (In thousands)
Beginning balance | $ | 7,541 |  |  | $ | — |  |  | $ | 7,541 |
Acquisition of business | — |  |  | 1,449 |  |  | 1,449 |
Impairment losses | — |  |  | — |  |  | — |
Ending balance | $ | 7,541 |  |  | $ | 1,449 |  |  | $ | 8,990 |
Schedule of Finite-Lived Intangible Assets | Other intangible assets, net consisted of the following:
| June 30, 2024
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (In thousands)
Patents: |  |  |  |  |  |  |
Intellectual property operations | 6 years |  | $ | 351,403 |  |  | $ | (322,787) |  |  | $ | 28,616 |
Industrial operations | 7 years |  | 3,400 |  |  | (1,324) |  |  | 2,076 |
Total patents |  |  | 354,803 |  |  | (324,111) |  |  | 30,692 |
Customer relationships - industrial operations | 7 years |  | 5,300 |  |  | (2,067) |  |  | 3,233 |
Trade name and trademarks - industrial operations | 7 years |  | 3,430 |  |  | (1,338) |  |  | 2,092 |
Total |  |  | $ | 363,533 |  |  | $ | (327,516) |  |  | $ | 36,017 |
| December 31, 2023
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (In thousands)
Patents: |  |  |  |  |  |  |
Intellectual property operations | 6 years |  | $ | 341,403 |  |  | $ | (316,114) |  |  | $ | 25,289 |
Industrial operations | 7 years |  | 3,400 |  |  | (1,083) |  |  | 2,317 |
Total patents |  |  | 344,803 |  |  | (317,197) |  |  | 27,606 |
Customer relationships - industrial operations | 7 years |  | 5,300 |  |  | (1,689) |  |  | 3,611 |
Trade name and trademarks - industrial operations | 7 years |  | 3,430 |  |  | (1,091) |  |  | 2,339 |
Total |  |  | $ | 353,533 |  |  | $ | (319,977) |  |  | $ | 33,556 |
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 2024 | $ | 10,291 |
2025 | 18,485 |
2026 | 4,173 |
2027 | 1,734 |
2028 | 1,334 |
Total | $ | 36,017 |

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