CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 96,462	$ 72,560
Restricted cash and cash equivalents	3,246	3,995
Accounts and other receivables, net	8,977	9,256
Inventories, net	15,098	16,863
Prepaid expenses and other	981	792
Total current assets	124,764	103,466
Other assets:
Marketable securities	19,260	92,131
Investment in Kronos Worldwide, Inc.	140,695	237,719
Goodwill	27,156	27,156
Other assets, net	3,331	2,143
Deferred income taxes	11	20
Total other assets	190,453	359,169
Property and equipment:
Land	5,138	5,138
Buildings	21,502	21,176
Equipment	64,051	62,264
Construction in progress	1,567	909
Property and equipment, gross	92,258	89,487
Less accumulated depreciation	58,152	55,931
Net property and equipment	34,106	33,556
Total assets	349,323	496,191
Current liabilities:
Accounts payable	4,557	6,115
Accrued and other current liabilities	10,558	10,862
Accrued environmental remediation and related costs	8,668	6,984
Payable to affiliates	220	659
Income taxes	5	7
Total current liabilities	24,008	24,627
Noncurrent liabilities:
Accrued pension cost	14,155	12,242
Accrued postretirement benefits (OPEB) costs	2,773	3,341
Accrued environmental remediation and related costs	104,465	103,031
Deferred income taxes	25,035	83,158
Other	13,636	18,342
Total noncurrent liabilities	$ 160,064	$ 220,114
NL stockholders' equity:
Preferred stock, no par value; 5,000 shares authorized; none issued
Common stock, $.125 par value; 150,000 shares authorized; 48,674 and 48,692 shares issued and outstanding	$ 6,086	$ 6,085
Additional paid-in capital	300,543	300,388
Retained earnings	88,679	112,588
Accumulated other comprehensive loss	(245,358)	(182,039)
Total NL stockholders' equity	149,950	237,022
Noncontrolling interest in subsidiary	15,301	14,428
Total equity	165,251	251,450
Total liabilities and equity	$ 349,323	$ 496,191
Commitments and contingencies (Notes 13 and 17)