CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 142,196	$ 137,039
Restricted cash and cash equivalents	2,734	2,695
Accounts and other receivables, net	15,157	11,142
Receivables from affiliates		313
Inventories, net	23,536	18,337
Prepaid expenses and other	3,093	1,638
Total current assets	186,716	171,164
Other assets:
Restricted cash and cash equivalents	25,503	25,538
Note receivable from affiliate	21,800	29,500
Marketable securities	27,943	18,206
Investment in Kronos Worldwide, Inc.	250,123	242,374
Goodwill	27,156	27,156
Other assets, net	5,259	5,262
Total other assets	357,784	348,036
Property and equipment:
Land	5,070	4,940
Buildings	23,161	23,146
Equipment	69,974	68,227
Construction in progress	1,240	1,010
Property and equipment, gross	99,445	97,323
Less accumulated depreciation	70,902	68,373
Net property and equipment	28,543	28,950
Total assets	573,043	548,150
Current liabilities:
Accounts payable	4,501	2,647
Accrued litigation settlement	11,774	11,830
Accrued and other current liabilities	10,532	10,253
Accrued environmental remediation and related costs	2,583	2,027
Payables to affiliates	738	725
Income taxes		25
Total current liabilities	30,128	27,507
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	90,407	91,389
Long-term litigation settlement	38,337	49,403
Deferred income taxes	41,375	33,830
Accrued pension costs	4,788	6,392
Other	2,124	3,780
Total noncurrent liabilities	177,531	185,294
NL stockholders' equity:
Common stock	6,100	6,098
Additional paid-in capital	300,309	299,093
Retained earnings	285,359	257,875
Accumulated other comprehensive loss	(248,873)	(251,189)
Total NL stockholders' equity	342,895	311,877
Noncontrolling interest in subsidiary	22,489	23,472
Total equity	365,384	335,349
Total liabilities and equity	573,043	548,150
Commitments and contingencies (Note 14)