CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 100,995	$ 96,462
Restricted cash and cash equivalents	3,336	3,246
Accounts and other receivables, net	13,282	8,977
Inventories, net	14,638	15,098
Prepaid expenses and other	856	981
Total current assets	133,107	124,764
Other assets:
Notes receivable from affiliate	10,700
Marketable securities	33,058	19,260
Investment in Kronos Worldwide, Inc.	138,550	140,695
Goodwill	27,156	27,156
Other assets, net	3,658	3,331
Deferred income taxes	11	11
Total other assets	213,133	190,453
Property and equipment:
Land	5,146	5,138
Buildings	22,812	21,502
Equipment	65,443	64,051
Construction in progress	873	1,567
Property and equipment, gross	94,274	92,258
Less accumulated depreciation	60,657	58,152
Net property and equipment	33,617	34,106
Total assets	379,857	349,323
Current liabilities:
Accounts payable	5,387	4,557
Accrued and other current liabilities	10,091	10,783
Accrued environmental remediation and related costs	13,361	8,668
Total current liabilities	28,839	24,008
Noncurrent liabilities:
Accrued pension costs	13,586	14,155
Accrued postretirement benefits (OPEB) costs	2,595	2,773
Accrued environmental remediation and related costs	103,450	104,465
Deferred income taxes	31,651	25,035
Other	13,567	13,636
Total noncurrent liabilities	164,849	160,064
NL stockholders' equity:
Common stock	6,088	6,086
Additional paid-in capital	300,674	300,543
Retained earnings	94,427	88,679
Accumulated other comprehensive loss	(231,080)	(245,358)
Total NL stockholders' equity	170,109	149,950
Noncontrolling interest in subsidiary	16,060	15,301
Total equity	186,169	165,251
Total liabilities and equity	379,857	349,323
Commitments and contingencies (Notes 11 and 13)