CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 109,999	$ 163,154
Restricted cash and cash equivalents	20,547	20,545
Accounts and other receivables, net	18,134	23,739
Inventories, net	29,158	28,366
Prepaid expenses and other	1,781	2,154
Total current assets	179,619	237,958
Other assets:
Restricted cash and cash equivalents	493	491
Note receivable from affiliate	9,300	9,300
Marketable securities	19,463	28,015
Investment in Kronos Worldwide, Inc.	259,459	250,278
Goodwill	27,156	27,156
Other assets, net	983	1,034
Total other assets	316,854	316,274
Property and equipment:
Land	5,390	5,390
Buildings	23,254	23,262
Equipment	75,967	75,605
Construction in progress	524	589
Property and equipment, gross	105,135	104,846
Less accumulated depreciation	81,583	80,820
Net property and equipment	23,552	24,026
Total assets	520,025	578,258
Current liabilities:
Accounts payable	3,970	3,758
Accrued litigation settlement	16,509	16,431
Accrued and other current liabilities	7,669	12,032
Accrued environmental remediation and related costs	1,773	58,135
Payables to affiliates	1,016	706
Total current liabilities	30,937	91,062
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	10,994	11,143
Deferred income taxes	59,323	53,391
Accrued pension costs	78	76
Other	1,363	6,183
Total noncurrent liabilities	72,258	71,293
NL stockholders' equity:
Preferred stock
Common stock	6,105	6,105
Additional paid-in capital	299,099	299,099
Retained earnings	311,327	315,056
Accumulated other comprehensive loss	(218,887)	(223,356)
Total NL stockholders' equity	397,644	396,904
Noncontrolling interest in subsidiary	19,186	18,999
Total equity	416,830	415,903
Total liabilities and equity	520,025	578,258
Commitments and contingencies (Notes 13 and 15)