Income taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income taxes

Schedule of Income Taxes

	Years ended December 31,
	2021		2022		2023
	(In thousands)
Expected tax expense (benefit), at U.S. federal statutory   income tax rate of 21%	$	12,776	$	8,241	$	(1,348)
Nontaxable dividends received from Kronos		(5,325)		(5,621)		(5,621)
U.S. state income taxes and other, net		28		165		(32)
Income tax expense (benefit)	$	7,479	$	2,785	$	(7,001)
Components of income tax expense (benefit):
Currently payable	$	26	$	495	$	307
Deferred income tax expense (benefit)		7,453		2,290		(7,308)
Income tax expense (benefit)	$	7,479	$	2,785	$	(7,001)
Comprehensive provision (benefit) for income taxes allocable to:
Net income	$	7,479	$	2,785	$	(7,001)
Other comprehensive income:
Currency translation		(429)		(1,849)		241
Pension plans		3,252		6,542		(291)
OPEB plans		(44)		69		(35)
Total	$	10,258	$	7,547	$	(7,086)

Components of Net Deferred Tax Liability

	December 31,
	2022				2023
	Assets		Liabilities		Assets		Liabilities
	(In thousands)
Tax effect of temporary differences related to:
Inventories	$	369	$	—	$	373	$	—
Marketable securities		—		(5,290)		—		(3,586)
Property and equipment		—		(2,025)		—		(1,467)
Accrued OPEB costs		168		—		139		—
Accrued pension costs		412		—		124		—
Accrued employee benefits		1,342		—		1,421		—
Accrued environmental liabilities		24,332		—		21,332		—
Goodwill		—		(1,693)		—		(1,693)
Other accrued liabilities and deductible differences		161		—		149		—
Other taxable differences		—		(2,391)		—		(2,392)
Investment in Kronos Worldwide, Inc.		—		(65,504)		—		(56,133)
Adjusted gross deferred tax assets (liabilities)		26,784		(76,903)		23,538		(65,271)
Netting of items by tax jurisdiction		(26,784)		26,784		(23,538)		23,538
Net noncurrent deferred tax liability	$	—	$	(50,119)	$	—	$	(41,733)