CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 96,643	$ 93,162
Restricted cash and cash equivalents	3,853	3,791
Accounts and other receivables, net	11,995	10,586
Inventories, net	15,313	14,974
Receivable from affiliate	571
Prepaid expenses and other	915	986
Total current assets	129,290	123,499
Other assets:
Notes receivable from affiliate	36,700	27,400
Marketable securities	34,926	49,731
Investment in Kronos Worldwide, Inc.	216,301	120,346
Goodwill	27,156	27,156
Other assets, net	3,570	3,276
Total other assets	318,653	227,909
Property and equipment:
Land	5,146	5,146
Buildings	23,038	22,811
Equipment	67,432	66,112
Construction in progress	680	1,098
Property and equipment, gross	96,296	95,167
Less accumulated depreciation	63,222	61,583
Net property and equipment	33,074	33,584
Total assets	481,017	384,992
Current liabilities:
Accounts payable	5,357	5,026
Accrued and other current liabilities	9,965	10,624
Accrued environmental remediation and related costs	11,400	13,350
Payable to affiliates	211	1,717
Income taxes	31	26
Total current liabilities	26,964	30,743
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued pension costs	11,678	12,874
Accrued postretirement benefits (OPEB) costs	2,133	2,310
Accrued environmental remediation and related costs	103,866	103,308
Deferred income taxes	56,990	27,445
Other	13,502	13,542
Total noncurrent liabilities	188,669	159,979
NL stockholders' equity:
Common stock	6,089	6,088
Additional paid-in capital	300,868	300,674
Retained earnings	170,993	104,004
Accumulated other comprehensive loss	(229,850)	(232,846)
Total NL stockholders' equity	248,100	177,920
Noncontrolling interest in subsidiary	17,284	16,350
Total equity	265,384	194,270
Total liabilities and equity	481,017	384,992
Commitments and contingencies (Note 13)