CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 151,248	$ 147,002
Restricted cash and cash equivalents	2,827	2,765
Accounts and other receivables, net	17,599	15,609
Receivables from affiliates	106
Inventories, net	33,303	25,642
Prepaid expenses and other	3,881	2,630
Total current assets	208,964	193,648
Other assets:
Restricted cash and cash equivalents	25,422	25,475
Note receivable from affiliate	16,600	18,700
Marketable securities	54,306	34,435
Investment in Kronos Worldwide, Inc.	275,853	264,803
Goodwill	27,156	27,156
Other assets, net	2,645	2,753
Total other assets	401,982	373,322
Property and equipment:
Land	5,071	5,071
Buildings	23,174	23,161
Equipment	72,754	70,664
Construction in progress	1,389	2,028
Property and equipment, gross	102,388	100,924
Less accumulated depreciation	72,929	71,742
Net property and equipment	29,459	29,182
Total assets	640,405	596,152
Current liabilities:
Accounts payable	6,420	3,408
Accrued litigation settlement	11,943	11,830
Accrued and other current liabilities	9,701	12,025
Accrued environmental remediation and related costs	2,753	2,643
Payables to affiliates	682	691
Total current liabilities	31,499	30,597
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	90,283	90,297
Long-term litigation settlement	38,886	38,519
Deferred income taxes	51,801	44,056
Accrued pension costs	3,116	3,722
Other	3,343	3,490
Total noncurrent liabilities	187,929	180,584
NL stockholders' equity:
Common stock	6,101	6,100
Additional paid-in capital	298,932	299,775
Retained earnings	339,327	297,351
Accumulated other comprehensive loss	(246,319)	(240,756)
Total NL stockholders' equity	398,041	362,470
Noncontrolling interest in subsidiary	22,936	22,501
Total equity	420,977	384,971
Total liabilities and equity	640,405	596,152
Commitments and contingencies (Notes 12 and 14)