GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents the changes in the carrying amount of goodwill for the six months ended June 30, 2025. The carrying amount of goodwill was $9.0 million as of June 30, 2024, and there were no changes in the carrying amount of goodwill during the six months ended June 30, 2024.

	June 30, 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	—		—		272		272
Measurement period adjustments	—		—		(3,829)		(3,829)
Ending balance	$	7,541	$	1,449	$	16,792	$	25,782

Schedule of Finite-Lived Intangible Assets

Other intangible assets, net consisted of the following:

	June 30, 2025
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Book Value
		(In thousands)
Patents:
Intellectual property operations	5 years	$	366,402	$	(342,144)	$	24,258
Industrial operations	7 years	3,400		(1,813)		1,587
Total patents		369,802		(343,957)		25,845
Customer relationships:
Industrial operations	7 years	5,300		(2,824)		2,476
Manufacturing operations	15 years	22,438		(1,029)		21,409
Total customer relationships		27,738		(3,853)		23,885
Trade name and trademarks:
Industrial operations	7 years	3,430		(1,828)		1,602
Manufacturing operations	10 years	401		(29)		372
Manufacturing operations	Indefinite	8,685		—		8,685
Total trade name and trademarks		12,516		(1,857)		10,659
Developed technology - manufacturing operations	10 years	1,000		(70)		930
Favorable leases - manufacturing operations	1.9 years	704		(380)		324
Total		$	411,760	$	(350,117)	$	61,643

	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	$	12,335
2026	10,970
2027	8,510
2028	4,243
2029	1,660
2030	1,660
Thereafter	13,580
Total	$	52,958