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Marketable securities (Tables)

3 Months Ended

Mar. 31, 2013

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Securities

		Fair value measurement level				Market value				Cost basis				Unrealized gains
						(In thousands)
December 31, 2012:
Noncurrent assets
Valhi common stock			1			$	179,662			$	24,347			$	155,315
March 31, 2013:
Noncurrent assets
Valhi common stock			1			$	230,686			$	24,347			$	206,339

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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