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Financial Instruments
9 Months Ended
Sep. 30, 2011
Financial Instruments [Abstract] 
Financial Instruments

3. Financial Instruments

The Company's valuation techniques for financial instruments are based on observable and unobservable inputs. Observable inputs reflect readily obtainable data from independent sources, while unobservable inputs reflect the Company's market assumptions. The ASC Topic on Fair Value Measurements classifies these inputs into the following hierarchy:

Level 1 Inputs – Quoted prices for identical instruments in active markets.

Level 2 Inputs – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3 Inputs – Instruments with primarily unobservable value drivers.

All of our agency securities and derivative and hedging assets and liabilities were valued using Level 2 inputs at September 30,2011 and December 31, 2010.  The carrying values and approximate fair values of all financial instruments as of September 30, 2011 and December 31, 2010 were as follows: