CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 111,361	$ 116,259
Restricted cash and cash equivalents	3,818	3,727
Accrued insurance recovery related to litigation settlement	15,000	15,000
Accounts and other receivables, net	15,681	12,440
Inventories, net	18,510	17,102
Receivable from affiliate	233	792
Prepaid expenses and other	1,143	1,324
Total current assets	165,746	166,644
Other assets:
Notes receivable from affiliate	40,000	34,000
Marketable securities	33,202	27,740
Investment in Kronos Worldwide, Inc.	259,061	255,565
Goodwill	27,156	27,156
Other assets, net	4,216	4,111
Total other assets	363,635	348,572
Property and equipment:
Land	5,151	5,151
Buildings	22,842	22,842
Equipment	67,526	67,446
Construction in progress	621	603
Property and equipment, gross	96,140	96,042
Less accumulated depreciation	64,724	64,016
Net property and equipment	31,416	32,026
Total assets	560,797	547,242
Current liabilities:
Accounts payable	4,497	4,831
Accrued litigation settlement	60,000	60,000
Accrued and other current liabilities	7,178	10,854
Accrued environmental remediation and related costs	4,746	5,027
Payable to affiliates	567	567
Income taxes	55	44
Total current liabilities	77,043	81,323
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued pension costs	10,122	10,389
Accrued environmental remediation and related costs	92,270	93,184
Long-term litigation settlement	17,000	17,000
Deferred income taxes	34,112	31,373
Other	9,850	9,915
Total noncurrent liabilities	163,854	162,361
NL stockholders' equity:
Common stock	6,090	6,090
Additional paid-in capital	301,139	301,139
Retained earnings	240,360	225,156
Accumulated other comprehensive loss	(247,537)	(248,270)
Total NL stockholders' equity	300,052	284,115
Noncontrolling interest in subsidiary	19,848	19,443
Total equity	319,900	303,558
Total liabilities and equity	560,797	547,242
Commitments and contingencies (Note 14)