CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 68,868	$ 147,002
Restricted cash and cash equivalents	2,864	2,765
Marketable securities	70,164
Accounts and other receivables, net	17,870	15,609
Receivables from affiliates	636
Inventories, net	31,290	25,642
Prepaid expenses and other	2,276	2,630
Total current assets	193,968	193,648
Other assets:
Restricted cash and cash equivalents	25,770	25,475
Note receivable from affiliate	13,200	18,700
Marketable securities	26,350	34,435
Investment in Kronos Worldwide, Inc.	292,206	264,803
Goodwill	27,156	27,156
Other assets, net	2,523	2,753
Total other assets	387,205	373,322
Property and equipment:
Land	5,390	5,071
Buildings	23,181	23,161
Equipment	74,113	70,664
Construction in progress	722	2,028
Property and equipment, gross	103,406	100,924
Less accumulated depreciation	74,712	71,742
Net property and equipment	28,694	29,182
Total assets	609,867	596,152
Current liabilities:
Accounts payable	3,537	3,408
Accrued litigation settlement	11,830	11,830
Accrued and other current liabilities	13,388	12,017
Accrued environmental remediation and related costs	2,627	2,643
Payables to affiliates	665	691
Income taxes	5	8
Total current liabilities	32,052	30,597
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	89,731	90,297
Long-term litigation settlement	27,427	38,519
Deferred income taxes	50,119	44,056
Accrued pension costs	3,012	3,722
Other	4,279	3,490
Total noncurrent liabilities	175,068	180,584
NL stockholders' equity:
Preferred stock, no par value; 5,000 shares authorized; none issued
Common stock; $.125 par value; 150,000 shares authorized; 48,803 and 48,816 shares issued and outstanding	6,101	6,100
Additional paid-in capital	298,598	299,775
Retained earnings	300,442	297,351
Accumulated other comprehensive loss	(222,991)	(240,756)
Total NL stockholders' equity	382,150	362,470
Noncontrolling interest in subsidiary	20,597	22,501
Total equity	402,747	384,971
Total liabilities and equity	609,867	596,152
Commitments and contingencies (Notes 13 and 16)