CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 93,409	$ 93,162
Restricted cash and cash equivalents	3,198	3,791
Accounts and other receivables, net	13,182	10,586
Inventories, net	15,347	14,974
Prepaid expenses and other	1,044	986
Total current assets	126,180	123,499
Other assets:
Notes receivable from affiliate	29,000	27,400
Marketable securities	47,143	49,731
Investment in Kronos Worldwide, Inc.	130,002	120,346
Goodwill	27,156	27,156
Other assets, net	3,383	3,276
Total other assets	236,684	227,909
Property and equipment:
Land	5,146	5,146
Buildings	22,812	22,811
Equipment	66,325	66,112
Construction in progress	783	1,098
Property and equipment, gross	95,066	95,167
Less accumulated depreciation	61,849	61,583
Net property and equipment	33,217	33,584
Total assets	396,081	384,992
Current liabilities:
Accounts payable	5,011	5,026
Accrued and other current liabilities	7,218	10,624
Accrued environmental remediation and related costs	13,113	13,350
Payable to affiliates	1,729	1,717
Income taxes	33	26
Total current liabilities	27,104	30,743
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued pension costs	12,702	12,874
Accrued postretirement benefits (OPEB) costs	2,227	2,310
Accrued environmental remediation and related costs	106,151	103,308
Deferred income taxes	29,923	27,445
Other	13,545	13,542
Total noncurrent liabilities	165,048	159,979
NL stockholders' equity:
Common stock	6,088	6,088
Additional paid-in capital	300,674	300,674
Retained earnings	112,354	104,004
Accumulated other comprehensive loss	(231,866)	(232,846)
Total NL stockholders' equity	187,250	177,920
Noncontrolling interest in subsidiary	16,679	16,350
Total equity	203,929	194,270
Total liabilities and equity	396,081	384,992
Commitments and contingencies (Note 13)