CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 111,522	$ 68,868
Restricted cash and cash equivalents	2,917	2,864
Marketable securities	53,149	70,164
Accounts and other receivables, net	17,101	17,870
Receivables from affiliates	628	636
Inventories, net	30,712	31,290
Prepaid expenses and other	2,235	2,276
Total current assets	218,264	193,968
Other assets:
Restricted cash and cash equivalents	26,943	25,770
Note receivable from affiliate	10,600	13,200
Marketable securities	18,194	26,350
Investment in Kronos Worldwide, Inc.	247,582	292,206
Goodwill	27,156	27,156
Other assets, net	2,060	2,523
Total other assets	332,535	387,205
Property and equipment:
Land	5,390	5,390
Buildings	23,239	23,181
Equipment	74,315	74,113
Construction in progress	676	722
Property and equipment, gross	103,620	103,406
Less accumulated depreciation	77,757	74,712
Net property and equipment	25,863	28,694
Total assets	576,662	609,867
Current liabilities:
Accounts payable	3,148	3,537
Accrued litigation settlement	11,830	11,830
Accrued and other current liabilities	13,182	13,393
Accrued environmental remediation and related costs	1,655	2,627
Payables to affiliates	634	665
Total current liabilities	30,449	32,052
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	89,451	89,731
Long-term litigation settlement	16,122	27,427
Deferred income taxes	41,733	50,119
Accrued pension costs	1,571	3,012
Other	5,074	4,279
Total noncurrent liabilities	154,451	175,068
NL stockholders' equity:
Preferred stock, no par value; 5,000 shares authorized; none issued
Common stock; $.125 par value; 150,000 shares authorized; 48,816 and 48,833 shares issued and outstanding	6,103	6,101
Additional paid-in capital	298,868	298,598
Retained earnings	284,462	300,442
Accumulated other comprehensive loss	(219,621)	(222,991)
Total NL stockholders' equity	369,812	382,150
Noncontrolling interest in subsidiary	21,950	20,597
Total equity	391,762	402,747
Total liabilities and stockholders' equity	576,662	609,867
Commitments and contingencies (Notes 13 and 16)