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Fair Value (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurement of Financial Assets


			Fair Value Measurements at Reporting Date Using
			(Level 1)		(Level 2)		(Level 3)
Description	As of June 30, 2011		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Cash equivalents:
Money market funds		$157,681		$157,681		$0		$0
Short-term investments:
U.S. Treasury obligations		100,679		100,679		0		0
Government agency obligations		26,235		0		26,235		0
Corporate obligations		20,222		0		20,222		0
Other assets:
Money market fund		7,848		7,848		0		0

		$312,665		$266,208		$46,457		$0

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References+ Details