This excerpt taken from the HAS 10-K filed Mar 9, 2005.
Marketable securities are comprised of investments in publicly-traded securities, classified as available-for-sale, and are recorded at market value with unrealized gains or losses, net of tax, reported as a component of accumulated other comprehensive earnings within shareholders' equity until realized. Unrealized losses are evaluated to determine the nature of the losses. If the losses are determined to be other than temporary, the basis of the security is adjusted and the loss is recognized in earnings at that time. These securities are included in other assets in the accompanying consolidated balance sheets.