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Fair Value Measurements
 6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Fair Value Measurements
B)
Fair Value Measurements. The Financial Accounting Standards Board (“FASB”) issued authoritative guidance for fair value measurements, which defines fair value, establishes a framework for measuring fair value, and expands disclosures for assets and liabilities measured at fair value in financial statements. The fair value guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
 
Our cash and cash equivalents, which primarily include money market funds, were $101.1 million and $46.6 million as of June 30, 2012 and December 31, 2011, respectively. We classified our cash and cash equivalents within Level 1 of the fair value hierarchy because they are valued using quoted market prices.
 
Our investments, which consist of high yield corporate debt securities, are also classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices. We categorize our investments as available-for-sale securities, and carry them at fair value in our financial statements. We had $0.7 million of available-for-sale investments as of December 31, 2011.