CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Current assets:
Cash and cash equivalents	$ 48,146	$ 68,868
Restricted cash and cash equivalents	2,865	2,864
Marketable securities	95,688	70,164
Accounts and other receivables, net	18,713	17,870
Receivables from affiliates	889	636
Inventories, net	30,235	31,290
Prepaid expenses and other	2,103	2,276
Total current assets	198,639	193,968
Other assets:
Restricted cash and cash equivalents	25,870	25,770
Note receivable from affiliate	12,200	13,200
Marketable securities	20,852	26,350
Investment in Kronos Worldwide, Inc.	278,449	292,206
Goodwill	27,156	27,156
Other assets, net	2,891	2,523
Total other assets	367,418	387,205
Property and equipment:
Land	5,389	5,390
Buildings	23,181	23,181
Equipment	74,377	74,113
Construction in progress	399	722
Property and equipment, gross	103,346	103,406
Less accumulated depreciation	75,432	74,712
Net property and equipment	27,914	28,694
Total assets	593,971	609,867
Current liabilities:
Accounts payable	3,925	3,537
Accrued litigation settlement	11,887	11,830
Accrued and other current liabilities	8,349	13,388
Accrued environmental remediation and related costs	1,889	2,627
Payables to affiliates	665	665
Income taxes	5	5
Total current liabilities	26,720	32,052
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	89,633	89,731
Long-term litigation settlement	27,557	27,427
Deferred income taxes	51,017	50,119
Accrued pension costs	3,063	3,012
Other	4,205	4,279
Total noncurrent liabilities	175,975	175,068
NL stockholders' equity:
Common stock; $.125 par value; 150,000 shares authorized; 48,803 and 48,816 shares issued and outstanding	6,101	6,101
Additional paid-in capital	298,252	298,598
Retained earnings	290,309	300,442
Accumulated other comprehensive loss	(224,368)	(222,991)
Total NL stockholders' equity	370,294	382,150
Noncontrolling interest in subsidiary	20,982	20,597
Total equity	391,276	402,747	$ 403,178
Total liabilities and equity	593,971	$ 609,867
Commitments and contingencies (Notes 13 and 16)