Marketable Securities

3 Months Ended

Mar. 31, 2012

Marketable Securities [Abstract]

Marketable Securities

NOTE 4. MARKETABLE SECURITIES

Our portfolio of marketable securities is comprised of debt securities that are classified as trading securities. At March 31, 2012, our marketable securities consisted of investments in mortgage-backed securities issued by the Government National Mortgage Association ("GNMA securities"). We report our trading securities at fair value, using prices provided by independent market participants that are based on observable inputs using market-based valuation techniques (Level 2 of the fair value hierarchy-see Note 5). Gains and losses resulting from the mark-to-market of these securities are recognized as unrealized gains or losses in income. For the three months ended March 31, 2012 and 2011, unrealized losses in our statement of operations, which are included in other income (expense), were $0.3 million for each period. Cumulative unrealized losses were $0.2 million as of March 31, 2012.