CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 65,837	$ 68,868
Restricted cash and cash equivalents	2,916	2,864
Marketable securities	80,217	70,164
Accounts and other receivables, net	19,773	17,870
Receivables from affiliates	905	636
Inventories, net	34,282	31,290
Prepaid expenses and other	2,185	2,276
Total current assets	206,115	193,968
Other assets:
Restricted cash and cash equivalents	26,064	25,770
Note receivable from affiliate	12,000	13,200
Marketable securities	15,882	26,350
Investment in Kronos Worldwide, Inc.	255,233	292,206
Goodwill	27,156	27,156
Other assets, net	1,812	2,523
Total other assets	338,147	387,205
Property and equipment:
Land	5,390	5,390
Buildings	23,181	23,181
Equipment	74,486	74,113
Construction in progress	512	722
Property and equipment, gross	103,569	103,406
Less accumulated depreciation	77,347	74,712
Net property and equipment	26,222	28,694
Total assets	570,484	609,867
Current liabilities:
Accounts payable	3,991	3,537
Accrued litigation settlement	11,774	11,830
Accrued and other current liabilities	11,710	13,393
Accrued environmental remediation and related costs	1,810	2,627
Payables to affiliates	736	665
Total current liabilities	30,021	32,052
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	89,385	89,731
Long-term litigation settlement	16,046	27,427
Deferred income taxes	42,729	50,119
Accrued pension costs	2,111	3,012
Other	3,984	4,279
Total noncurrent liabilities	154,755	175,068
NL stockholders' equity:
Common stock	6,103	6,101
Additional paid-in capital	298,868	298,598
Retained earnings	280,295	300,442
Accumulated other comprehensive loss	(221,027)	(222,991)
Total NL stockholders' equity	364,239	382,150
Noncontrolling interest in subsidiary	21,469	20,597
Total equity	385,708	402,747
Total liabilities and equity	570,484	609,867
Commitments and contingencies (Notes 12 and 14)