Annual report pursuant to Section 13 and 15(d)

Trading Securities, at Fair Value (Notes)

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Trading Securities, at Fair Value (Notes)
12 Months Ended
Dec. 31, 2011
Trading Securities, at Fair Value [Abstract]  
Trading Securities, at Fair Value
Trading Securities, at Fair Value
During the year ended December 31, 2011, the Company acquired and sold U.S. Treasuries in its taxable REIT subsidiary and classified these securities as trading instruments due to its short-term investment objectives. As of December 31, 2011 and December 31, 2010, the Company held U.S. Treasuries with an amortized cost of $1.0 billion and $0.2 billion and a fair value of $1.0 billion and $0.2 billion, respectively, classified as trading securities. The unrealized gains and losses included within trading securities was a positive $3.1 million as of December 31, 2011 and a negative $0.5 million as of December 31, 2010.
For the years ended December 31, 2011 and December 31, 2010, the Company sold trading securities for $1.2 billion and $58.5 million with an amortized cost of $1.2 billion and $58.2 million resulting in realized gains of $3.3 million and $0.3 million, respectively, on the sale of these investment securities. For the years ended December 31, 2011 and December 31, 2010, trading securities experienced unrealized gains of $3.5 million and unrealized losses of $0.5 million, respectively. Both realized and unrealized gains and losses are recorded as a component of gains on investment securities, net in the Company's consolidated statements of operations and comprehensive income (loss).
At December 31, 2011, the Company pledged trading securities with a carrying value of $1.0 billion as collateral for repurchase agreements. See Note 11 - Repurchase Agreements.