CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 88,392	$ 72,560
Restricted cash and cash equivalents	3,306	3,995
Accounts and other receivables, net	12,735	9,256
Inventories, net	15,448	16,863
Prepaid expenses and other	831	792
Deferred income taxes	4,567	4,567
Total current assets	125,279	108,033
Other assets:
Marketable securities	27,165	92,131
Investment in Kronos Worldwide, Inc.	154,588	237,719
Goodwill	27,156	27,156
Other assets, net	2,494	2,143
Deferred income taxes	20	20
Total other assets	211,423	359,169
Property and equipment:
Land	5,138	5,138
Buildings	21,498	21,176
Equipment	63,632	62,264
Construction in progress	1,749	909
Property and equipment, gross	92,017	89,487
Less accumulated depreciation	58,489	55,931
Net property and equipment	33,528	33,556
Total assets	370,230	500,758
Current liabilities:
Accounts payable	5,107	6,115
Accrued and other current liabilities	9,902	11,521
Accrued environmental remediation and related costs	6,989	6,984
Income taxes	13	7
Total current liabilities	22,011	24,627
Noncurrent liabilities:
Accrued pension cost	11,237	12,242
Accrued postretirement benefits (OPEB) costs	3,081	3,341
Accrued environmental remediation and related costs	104,622	103,031
Deferred income taxes	36,935	87,725
Other	13,667	18,342
Total noncurrent liabilities	169,542	224,681
NL stockholders' equity:
Common stock	6,086	6,085
Additional paid-in capital	300,543	300,388
Retained earnings	94,306	112,588
Accumulated other comprehensive loss	(237,425)	(182,039)
Total NL stockholders' equity	163,510	237,022
Noncontrolling interest in subsidiary	15,167	14,428
Total equity	178,677	251,450
Total liabilities and equity	$ 370,230	$ 500,758
Commitments and contingencies (Notes 11 and 13)