This excerpt taken from the ELN 20-F filed Feb 26, 2009.
(d) Fair value measurements
We adopted SFAS No. 157, Fair Value Measurements, (SFAS 157) effective January 1, 2008 for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis (at least annually). SFAS 157 defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. The adoption of SFAS 157 for financial assets and liabilities and non-financial assets and liabilities that are remeasured and reported at fair value, at least annually, did not have an impact on our financial results.
SFAS 157 defines fair value as the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date and in the principal or most advantageous market for that asset or liability. The fair value should be calculated based on assumptions that market participants would use in pricing the asset or liability, not on assumptions specific to the entity. In addition, the fair value of liabilities should include consideration of non-performance risk including our own credit risk.
In addition to defining fair value, SFAS 157 expands the disclosure requirements around fair value and establishes a fair value hierarchy for valuation inputs. The hierarchy prioritizes the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels, which is determined by the lowest level input that is significant to the fair value measurement in its entirety. These levels are: