CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 147,002	$ 137,039
Restricted cash and cash equivalents	2,765	2,695
Accounts and other receivables, net	15,609	11,142
Receivables from affiliates		313
Inventories, net	25,642	18,337
Prepaid expenses and other	2,630	1,638
Total current assets	193,648	171,164
Other assets:
Restricted cash and cash equivalents	25,475	25,538
Note receivable from affiliate	18,700	29,500
Marketable securities	34,435	18,206
Investment in Kronos Worldwide, Inc.	264,803	242,374
Goodwill	27,156	27,156
Other assets, net	2,753	5,262
Total other assets	373,322	348,036
Property and equipment:
Land	5,071	4,940
Buildings	23,161	23,146
Equipment	70,664	68,227
Construction in progress	2,028	1,010
Property and equipment, gross	100,924	97,323
Less accumulated depreciation	71,742	68,373
Net property and equipment	29,182	28,950
Total assets	596,152	548,150
Current liabilities:
Accounts payable	3,408	2,647
Accrued litigation settlement	11,830	11,830
Accrued and other current liabilities	12,017	10,253
Accrued environmental remediation and related costs	2,643	2,027
Payables to affiliates	691	725
Income taxes	8	25
Total current liabilities	30,597	27,507
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	90,297	91,389
Long-term litigation settlement	38,519	49,403
Deferred income taxes	44,056	33,830
Accrued pension costs	3,722	6,392
Other	3,490	3,780
Total noncurrent liabilities	180,584	185,294
NL stockholders' equity:
Preferred stock, no par value; 5,000 shares authorized; none issued
Common stock, $.125 par value; 150,000 shares authorized; 48,789 and 48,803 shares issued and outstanding	6,100	6,098
Additional paid-in capital	299,775	299,093
Retained earnings	297,351	257,875
Accumulated other comprehensive loss	(240,756)	(251,189)
Total NL stockholders' equity	362,470	311,877
Noncontrolling interest in subsidiary	22,501	23,472
Total equity	384,971	335,349
Total liabilities and equity	596,152	548,150
Commitments and contingencies (Notes 14 and 17)