CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 58,523	$ 68,868
Restricted cash and cash equivalents	2,913	2,864
Marketable securities	95,716	70,164
Accounts and other receivables, net	15,081	17,870
Receivables from affiliates	601	636
Inventories, net	33,765	31,290
Prepaid expenses and other	1,774	2,276
Total current assets	208,373	193,968
Other assets:
Restricted cash and cash equivalents	25,938	25,770
Note receivable from affiliate	12,200	13,200
Marketable securities	15,391	26,350
Investment in Kronos Worldwide, Inc.	268,469	292,206
Goodwill	27,156	27,156
Other assets, net	1,771	2,523
Total other assets	350,925	387,205
Property and equipment:
Land	5,390	5,390
Buildings	23,181	23,181
Equipment	74,525	74,113
Construction in progress	434	722
Property and equipment, gross	103,530	103,406
Less accumulated depreciation	76,407	74,712
Net property and equipment	27,123	28,694
Total assets	586,421	609,867
Current liabilities:
Accounts payable	5,224	3,537
Accrued litigation settlement	11,943	11,830
Accrued and other current liabilities	9,671	13,393
Accrued environmental remediation and related costs	1,850	2,627
Payables to affiliates	650	665
Total current liabilities	29,338	32,052
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	89,509	89,731
Long-term litigation settlement	27,688	27,427
Deferred income taxes	43,682	50,119
Accrued pension costs	2,754	3,012
Other	4,176	4,279
Total noncurrent liabilities	168,309	175,068
NL stockholders' equity:
Common stock	6,103	6,101
Additional paid-in capital	298,868	298,598
Retained earnings	283,784	300,442
Accumulated other comprehensive loss	(221,098)	(222,991)
Total NL stockholders' equity	367,657	382,150
Noncontrolling interest in subsidiary	21,117	20,597
Total equity	388,774	402,747
Total liabilities and equity	586,421	609,867
Commitments and contingencies (Notes 12 and 14)