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Marketable Securities | 6 Months Ended
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Jun. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Marketable securities | Note 4 – Marketable securities: Our marketable securities consist of investments in the publicly-traded shares of our immediate parent company Valhi, Inc. Our shares of Valhi common stock are accounted for as available-for-sale securities, which are carried at fair value using quoted market prices in active markets and represent a Level 1 input within the fair value hierarchy. Any unrealized gains or losses on the securities are recognized in Marketable equity securities on our Condensed Consolidated Statements of Income.
| Fair value measurement level |  | Market value |  |  | Cost basis |  |  | Unrealized gain (loss) |
|  |  | (In thousands) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock | 1 |  | $ | 18,206 |  |  | $ | 24,347 |  |  | $ | (6,141 | )
June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock | 1 |  | $ | 29,141 |  |  | $ | 24,347 |  |  | $ | 4,794 |
At December 31, 2020 and June 30, 2021, we held approximately 1.2 million shares of common stock of our immediate parent company, Valhi, Inc. At December 31, 2020 and June 30, 2021, the quoted per share market price of Valhi common stock was $15.20 and $24.33, respectively. The Valhi common stock we own is subject to restrictions on resale pursuant to certain provisions of the SEC Rule 144. In addition, as a majority-owned subsidiary of Valhi, we cannot vote our shares of Valhi common stock under Delaware General Corporation Law, but we receive dividends from Valhi on these shares, when declared and paid.

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