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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 6 Months Ended
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 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:
June 30, 2024
Weighted Average Amortization PeriodGross Carrying AmountAccumulated AmortizationNet Book Value
(In thousands)
Patents:
Intellectual property operations6 years$351,403 $(322,787)$28,616 
Industrial operations7 years3,400 (1,324)2,076 
Total patents354,803 (324,111)30,692 
Customer relationships - industrial operations7 years5,300 (2,067)3,233 
Trade name and trademarks - industrial operations7 years3,430 (1,338)2,092 
Total$363,533 $(327,516)$36,017 
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$10,291 
202518,485 
20264,173 
20271,734 
20281,334 
Total$36,017