CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 83,155	$ 72,560
Restricted cash and cash equivalents	3,549	3,995
Accounts and other receivables, net	14,393	9,256
Inventories, net	16,118	16,863
Prepaid expenses and other	831	792
Deferred income taxes	4,567	4,567
Total current assets	122,613	108,033
Other assets:
Marketable securities	81,351	92,131
Investment in Kronos Worldwide, Inc.	167,941	237,719
Goodwill	27,156	27,156
Other assets, net	2,327	2,143
Deferred income taxes	20	20
Total other assets	278,795	359,169
Property and equipment:
Land	5,138	5,138
Buildings	21,297	21,176
Equipment	63,291	62,264
Construction in progress	1,478	909
Property and equipment, gross	91,204	89,487
Less accumulated depreciation	57,600	55,931
Net property and equipment	33,604	33,556
Total assets	435,012	500,758
Current liabilities:
Accounts payable	9,561	6,115
Accrued and other current liabilities	8,513	11,521
Accrued environmental remediation and related costs	7,064	6,984
Income taxes	8	7
Total current liabilities	25,146	24,627
Noncurrent liabilities:
Accrued pension cost	11,521	12,242
Accrued postretirement benefits (OPEB) costs	3,150	3,341
Accrued environmental remediation and related costs	104,944	103,031
Deferred income taxes	61,015	87,725
Other	13,694	18,342
Total noncurrent liabilities	194,324	224,681
NL stockholders' equity:
Common stock	6,086	6,085
Additional paid-in capital	300,543	300,388
Retained earnings	93,363	112,588
Accumulated other comprehensive loss	(199,406)	(182,039)
Total NL stockholders' equity	200,586	237,022
Noncontrolling interest in subsidiary	14,956	14,428
Total equity	215,542	251,450
Total liabilities and equity	$ 435,012	$ 500,758
Commitments and contingencies (Notes 11 and 13)