GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

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