Marketable securities (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

	Fair value			Cost or
	measurement	Market		amortized		Unrealized
	level	value		cost		loss, net
		(In thousands)
December 31, 2023
Current assets - Fixed income securities	2	$	53,149	$	53,181	$	(32)
Noncurrent assets - Valhi common stock	1	$	18,194	$	24,347	$	(6,153)
June 30, 2024
Current assets - Fixed income securities	2	$	11,934	$	11,935	$	(1)
Noncurrent assets - Valhi common stock	1	$	21,356	$	24,347	$	(2,991)