Marketable securities (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

	Fair value			Cost or
	measurement	Market		amortized		Unrealized
	level	value		cost		gain (loss), net
		(In thousands)
December 31, 2022
Current assets
Fixed income securities	2	$	70,164	$	70,226		(62)
Noncurrent assets
Valhi common stock	1	$	26,350	$	24,347	$	2,003
September 30, 2023
Current assets
Fixed income securities	2	$	80,217	$	80,425	$	(208)
Noncurrent assets
Valhi common stock	1	$	15,882	$	24,347	$	(8,465)