Fair Value Measurements Fair Value Measurement Policy (Policies)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

We measure certain assets and liabilities at fair value on a recurring or nonrecurring basis. We categorize each of our fair value measurements into one of three levels as follows:

• Level 1: Inputs based on quoted market prices for identical assets or liabilities in active markets;

• Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data; or

• Level 3: Unobservable inputs that are not corroborated by market data and typically reflect management's estimates of assumptions that market participants would use in pricing the asset. The fair values are then determined using model-based techniques.