CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 133,406	$ 129,730
Restricted cash and cash equivalents	2,697	2,695
Accounts and other receivables, net	15,294	11,929
Inventories, net	18,962	18,348
Receivables from affiliates	438	581
Prepaid expenses and other	1,272	1,401
Total current assets	172,069	164,684
Other assets:
Restricted cash and cash equivalents	25,475	25,445
Note receivable from affiliate	25,500	28,100
Marketable securities	14,804	26,877
Investment in Kronos Worldwide, Inc.	238,067	248,355
Goodwill	27,156	27,156
Other assets, net	5,672	5,860
Total other assets	336,674	361,793
Property and equipment:
Land	4,940	4,940
Buildings	23,047	23,047
Equipment	68,443	67,718
Construction in progress	463	1,002
Property and equipment, gross	96,893	96,707
Less accumulated depreciation	66,531	65,692
Net property and equipment	30,362	31,015
Total assets	539,105	557,492
Current liabilities:
Accounts payable	3,300	3,438
Accrued litigation settlement	11,887	11,830
Accrued and other current liabilities	7,483	10,601
Accrued environmental remediation and related costs	3,357	3,065
Payables to affiliates	757	801
Income taxes	84	73
Total current liabilities	26,868	29,808
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	90,882	91,443
Long-term litigation settlement	60,367	60,081
Deferred income taxes	28,196	33,957
Accrued pension costs	7,894	8,230
Other	6,193	6,260
Total noncurrent liabilities	194,032	200,471
NL stockholders' equity:
Common stock	6,094	6,094
Additional paid-in capital	298,865	299,102
Retained earnings	250,960	251,000
Accumulated other comprehensive loss	(260,845)	(251,690)
Total NL stockholders' equity	295,074	304,506
Noncontrolling interest in subsidiary	23,131	22,707
Total equity	318,205	327,213
Total liabilities and equity	539,105	557,492
Commitments and contingencies (Note 14)