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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill consisted of the following:
March 31, 2024
Industrial OperationsEnergy OperationsTotal
(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 OperationsEnergy OperationsTotal
(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:
March 31, 2024
Weighted Average Amortization PeriodGross Carrying AmountAccumulated AmortizationNet Book Value
(In thousands)
Patents:
Intellectual property operations6 years$341,403 $(319,547)$21,856 
Industrial operations7 years3,400 (1,203)2,197 
Total patents344,803 (320,750)24,053 
Customer relationships - industrial operations7 years5,300 (1,878)3,422 
Trade name and trademarks - industrial operations7 years3,430 (1,215)2,215 
Total$353,533 $(323,843)$29,690 
December 31, 2023
Weighted Average Amortization PeriodGross Carrying AmountAccumulated AmortizationNet Book Value
(In thousands)
Patents:
Intellectual property operations6 years$341,403 $(316,114)$25,289 
Industrial operations7 years3,400 (1,083)2,317 
Total patents344,803 (317,197)27,606 
Customer relationships - industrial operations7 years5,300 (1,689)3,611 
Trade name and trademarks - industrial operations7 years3,430 (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$10,964 
202512,485 
20263,173 
20271,734 
20281,334 
Total$29,690