Fair Value Measurements (Tables)

The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis (in thousands):



			Fair Value Measurement at Reporting Date Using
Description	As of December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	750,004	$	750,004	$	—	$	—

Liabilities:
Contingent consideration	$	13,218	$	—	$	1,988	$	11,230



			Fair Value Measurement at Reporting Date Using
Description	As of September 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	585,331	$	585,331	$	—	$	—

Liabilities:
Contingent consideration	$	12,601	$	—	$	—	$	12,601

The following table provides a roll-forward of the fair value of the contingent consideration categorized as Level 3 for the three and nine months ended September 30, 2011 and 2012 (in thousands):



	Three Months Ended September 30,					Nine Months Ended September 30,
	2011			2012		2011			2012
Beginning balance	$	15,920		$	6,081	$	—		$	11,230
Issuance of contingent consideration in connection with acquisitions	1,835			2,100		17,755			2,100
Payments made on contingent liabilities	—			—		—			(4,250		)
Change in fair value and other ⁽¹⁾	(4,793		)	3,176		(4,793		)	2,277
Reclass of contingent consideration from Level 2 to Level 3	—			1,244		—			1,244
Ending balance	$	12,962		$	12,601	$	12,962		$	12,601

Unrealized (gains) losses still held ⁽²⁾	$	(4,793	)	$	3,176	$	(4,793	)	$	2,277


(1)	Changes in the fair value of contingent consideration liabilities are classified as "acquisition-related expense (benefit), net" in the condensed consolidated statements of operations.


(2)	Represents the unrealized gains (losses) recorded in earnings during the period for assets (and liabilities) classified as Level 3 that are still held (or outstanding) at the end of the period.

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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