CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 117,826	$ 16,693	$ (22,716)
Depreciation and amortization	3,734	3,774	3,609
Deferred income taxes	(603)	(4,330)	(24,030)
Cash funding of benefit plans in excess of net benefit plan expense	(603)	(277)	(1,349)
Equity in losses (earnings) of Kronos Worldwide, Inc.	(107,785)	(13,171)	52,770
Dividends received from Kronos Worldwide, Inc.	21,132	21,132	21,132
Other, net	283	362	421
Change in assets and liabilities:
Accounts and other receivables, net	(117)	(1,601)	246
Inventories, net	(473)	(37)	1,532
Prepaid expenses and other	(177)	(5)	(189)
Accounts payable and accrued liabilities	(1,700)	(172)	(1,721)
Income taxes	7	18	(2)
Accounts with affiliates	(3,041)	2,075	(439)
Accrued environmental remediation and related costs	(4,749)	3,526	3,118
Other noncurrent assets and liabilities, net	(5,096)	(288)	(4,746)
Net cash provided by operating activities	18,638	27,699	27,636
Cash flows from investing activities:
Capital expenditures	(2,810)	(3,206)	(4,304)
Promissory notes receivable from affiliate:
Loans	(52,100)	(36,600)
Collections	41,300	9,200
Purchase of marketable securities			(251)
Proceeds from the disposal of marketable securities			255
Other	4
Net cash used in investing activities	(13,606)	(30,606)	(4,300)
Cash flows from financing activities:
Distributions to noncontrolling interests in subsidiary	(333)	(332)	(330)
Indebtedness - borrowings from affiliate		500
Net cash provided by (used in) financing activities	(333)	168	(330)
Cash, cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	4,699	(2,739)	23,006
Balance at beginning of year	98,242	100,981	77,975
Balance at end of year	102,941	98,242	100,981
Cash paid for:
Interest	30	4
Income taxes, net	$ 3,109	$ 70	$ 611