CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 98,316	$ 93,162
Restricted cash and cash equivalents	3,370	3,791
Accounts and other receivables, net	10,670	10,572
Receivable from affiliate	1,767	14
Inventories, net	15,382	14,974
Prepaid expenses and other	1,162	986
Total current assets	130,667	123,499
Other assets:
Note receivable from affiliate	38,200	27,400
Marketable securities	88,681	49,731
Investment in Kronos Worldwide, Inc.	229,543	120,346
Goodwill	27,156	27,156
Other assets, net	4,843	3,276
Total other assets	388,423	227,909
Property and equipment:
Land	5,146	5,146
Buildings	23,044	22,811
Equipment	67,926	66,112
Construction in progress	569	1,098
Property and equipment, gross	96,685	95,167
Less accumulated depreciation	64,159	61,583
Net property and equipment	32,526	33,584
Total assets	551,616	384,992
Current liabilities:
Accounts payable	4,116	5,026
Accrued and other current liabilities	9,707	10,624
Accrued environmental remediation and related costs	5,302	13,350
Payable to affiliates	429	1,717
Income taxes	30	26
Total current liabilities	19,584	30,743
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued pension costs	12,194	12,874
Accrued postretirement benefits (OPEB) costs	1,846	2,310
Accrued environmental remediation and related costs	106,607	103,308
Deferred income taxes	49,315	27,445
Other	8,492	13,542
Total noncurrent liabilities	178,954	159,979
NL stockholders' equity:
Preferred stock, no par value; 5,000 shares authorized; none issued
Common stock, $.125 par value; 150,000 shares authorized; 48,706 and 48,715 shares issued and outstanding	6,089	6,088
Additional paid-in capital	300,866	300,674
Retained earnings	220,104	104,004
Accumulated other comprehensive loss	(191,737)	(232,846)
Total NL stockholders' equity	335,322	177,920
Noncontrolling interest in subsidiary	17,756	16,350
Total equity	353,078	194,270
Total liabilities and equity	551,616	384,992
Commitments and contingencies (Notes 14 and 17)