CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 123,028	$ 98,316
Restricted cash and cash equivalents	4,254	3,370
Accounts and other receivables, net	28,869	10,670
Inventories, net	17,159	15,382
Receivable from affiliate		1,767
Prepaid expenses and other	1,052	1,162
Total current assets	174,362	130,667
Other assets:
Notes receivable from affiliate	33,000	38,200
Marketable securities	32,770	88,681
Investment in Kronos Worldwide, Inc.	265,776	229,543
Goodwill	27,156	27,156
Other assets, net	5,137	4,843
Total other assets	363,839	388,423
Property and equipment:
Land	5,151	5,146
Buildings	22,704	23,044
Equipment	66,118	67,926
Construction in progress	994	569
Property and equipment, gross	94,967	96,685
Less accumulated depreciation	63,209	64,159
Net property and equipment	31,758	32,526
Total assets	569,959	551,616
Current liabilities:
Accounts payable	5,833	4,116
Accrued and other current liabilities	70,050	9,707
Accrued environmental remediation and related costs	17,762	5,302
Payable to affiliates	1,600	429
Income taxes	46	30
Total current liabilities	95,291	19,584
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued pension costs	9,242	12,194
Accrued postretirement benefits (OPEB) costs	1,709	1,846
Accrued environmental remediation and related costs	93,720	106,607
Deferred income taxes	32,781	49,315
Other	25,396	8,492
Total noncurrent liabilities	163,348	178,954
NL stockholders' equity:
Common stock	6,090	6,089
Additional paid-in capital	301,139	300,866
Retained earnings	222,421	220,104
Accumulated other comprehensive loss	(237,507)	(191,737)
Total NL stockholders' equity	292,143	335,322
Noncontrolling interest in subsidiary	19,177	17,756
Total equity	311,320	353,078
Total liabilities and equity	569,959	551,616
Commitments and contingencies (Note 14)