Marketable securities (Tables)

6 Months Ended

Jun. 30, 2022

Marketable securities

Schedule of Marketable Securities

	Fair value
	measurement	Market		Cost		Unrealized
	level	value		basis		gain
		(In thousands)
December 31, 2021
Noncurrent assets
Valhi common stock	1	$	34,435	$	24,347	$	10,088
June 30, 2022
Noncurrent assets
Valhi common stock	1	$	54,306	$	24,347	$	29,959