Marketable Securities

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Marketable Securities

NOTE 5. MARKETABLE SECURITIES

Our portfolio of marketable securities is comprised of debt securities that are classified as trading securities. At December 31, 2011, 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 6). Gains and losses resulting from the mark-to-market of these securities are recognized as unrealized gains or losses in income. For the year ended December 31, 2011, unrealized gains in our statement of operations, which are included in other income (expense), were $0.1 million. Cumulative unrealized gains were $0.1 million as of December 31, 2011.