GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2026

Intangible Asset, Goodwill and Other [Abstract]

Goodwill

Changes in the carrying amount of goodwill consisted of the following:

	Industrial Operations		Energy Operations		Manufacturing Operations		Total
	(In thousands)
Balance at December 31, 2025	$	7,541	$	1,449	$	16,800	$	25,790
Effect of foreign currency translation	—		—		(55)		(55)
Impairment losses	—		—		—		—
Balance at March 31, 2026	$	7,541	$	1,449	$	16,745	$	25,735

Intangible Asset, Finite-Lived

Other intangible assets, net consisted of the following:

	March 31, 2026
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Book Value
		(In thousands)
Patents:
Intellectual property operations	5 years	$	368,153	$	(356,473)	$	11,680
Industrial operations	7 years	3,400		(2,176)		1,224
Total patents		371,553		(358,649)		12,904
Customer relationships:
Industrial operations	7 years	5,300		(3,392)		1,908
Manufacturing operations	15 years	21,843		(2,084)		19,759
Total customer relationships		27,143		(5,476)		21,667
Trade name and trademarks:
Industrial operations	7 years	3,430		(2,195)		1,235
Manufacturing operations	10 years	399		(59)		340
Manufacturing operations	Indefinite	8,073		—		8,073
Total trade name and trademarks		11,902		(2,254)		9,648
Developed technology - manufacturing operations	10 years	1,000		(145)		855
Favorable leases - manufacturing operations	1.9 years	419		(199)		220
Total		$	412,017	$	(366,723)	$	45,294

	December 31, 2025
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Book Value
		(In thousands)
Patents:
Intellectual property operations	5 years	$	366,402	$	(352,713)	$	13,689
Industrial operations	7 years	3,400		(2,055)		1,345
Total patents		369,802		(354,768)		15,034
Customer relationships:
Industrial operations	7 years	5,300		(3,203)		2,097
Manufacturing operations	15 years	21,830		(1,702)		20,128
Total customer relationships		27,130		(4,905)		22,225
Trade name and trademarks:
Industrial operations	7 years	3,430		(2,072)		1,358
Manufacturing operations	10 years	401		(49)		352
Manufacturing operations	Indefinite	8,043		—		8,043
Total trade name and trademarks		11,874		(2,121)		9,753
Developed technology - manufacturing operations	10 years	1,000		(120)		880
Favorable leases - manufacturing operations	1.9 years	705		(449)		256
Total		$	410,511	$	(362,363)	$	48,148

Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense

The following table presents the scheduled annual aggregate amortization expense (in thousands):

Years Ending December 31,
Remainder of 2026	$	6,989
2027	9,303
2028	4,405
2029	1,611
2030	1,611
2031	1,611
Thereafter	11,691
Total	$	37,221