Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

FAIR VALUE MEASUREMENTS [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

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, 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	$	585,393	$	585,393	$	—	$	—
Available-for-sale debt security	$	3,087	$	—	$	—	$	3,087
Liabilities:
Contingent consideration	$	7,601	$	—	$	—	$	7,601

			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, Assets and Liabilities, Reconciliation of Level 3 Inputs [Table Text Block]

The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the year ended December 31, 2012 (in thousands):

	Available-for-Sale Debt Security			Contingent Consideration
Beginning balance	$	—		$	11,230
Issuance of contingent consideration in connection with acquisitions	—			3,400
Purchase of available-for-sale debt security	3,000			—
Total gains or losses (realized / unrealized)	—			—
Loss included in earnings (1)	—			897
Gain included in other comprehensive income	87			—
Settlements of contingent consideration liabilities	—			(4,936		)
Reclass to non-fair value liabilities when no longer contingent	—			(4,978		)
Reclass of contingent consideration from Level 2 to Level 3	—			1,988
Ending balance	$	3,087		$	7,601
Unrealized (gains) losses still held (2)	$	(87	)	$	211

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

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

The following table provides a roll-forward of the fair value of the contingent consideration categorized as Level 3 for the years ended December 31, 2011 and 2010 (in thousands):

	Year Ended December 31,
	2011			2010
Beginning balance	$	—		$	—
Issuance of contingent consideration in connection with acquisitions	17,755			63,180
Settlements of contingent consideration liabilities	—			(266,363		)
Change in fair value and other (1)	(4,537		)	203,183
Reclass of contingent consideration between Level 2 and Level 3	(1,988		)	—
Ending balance	$	11,230		$	—
Unrealized gains still held (2)	$	(4,537	)	$	—

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

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

Fair Value Measurements, Nonrecurring [Table Text Block]

The following tables summarize the Company's assets that are measured at fair value on a nonrecurring basis (in thousands) as of December 31, 2012. There were no nonrecurring fair value measurements at December 31, 2011 and 2010.

			Fair Value Measurement at Reporting Date Using
Description	As of December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset impairments:
Cost method investment	$	77,521	$	—	$	—	$	77,521
Equity method investment	$	495	$	—	$	—	$	495