Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities [Abstract]

Marketable Securities

The following is a summary of available-for-sale marketable securities held as of June 30, 2013 and December 31, 2012 (in thousands):

			Gross Unrealized							Classification on Balance Sheet
	Amortized Cost		Gains		Losses			Aggregate Fair Value		Short-term Marketable Securities		Long-term Marketable Securities
As of June 30, 2013
Certificates of deposit	$	272	$	—	$	—		$	272	$	222	$	50
Commercial paper	7,496		3		—			7,499		7,499		—
Corporate bonds	716,669		558		(1,477		)	715,750		298,816		416,934
U.S. government agency obligations	190,455		6		(435		)	190,026		19,540		170,486
	$	914,892	$	567	$	(1,912	)	$	913,547	$	326,077	$	587,470
As of December 31, 2012
Certificates of deposit	$	3,100	$	—	$	—		$	3,100	$	3,057	$	43
Commercial paper	7,481		2		(1		)	7,482		7,482		—
Corporate bonds	691,931		1,269		(205		)	692,995		217,548		475,447
U.S. government agency obligations	189,607		95		(28		)	189,674		7,505		182,169
	$	892,119	$	1,366	$	(234	)	$	893,251	$	235,592	$	657,659

Schedule of Fair Value Measurement

The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets, including investments and cash equivalents and liabilities, at June 30, 2013 and December 31, 2012 (in thousands):

	Total Fair Value			Fair Value Measurements at Reporting Date Using
				Level 1		Level 2		Level 3
As of June 30, 2013
Cash Equivalents and Marketable Securities:
Money market funds	$	4,550		$	4,550	$	—	$	—
Certificates of deposit	4,436			4,436		—		—
Commercial paper	7,499			—		7,499		—
Corporate bonds	715,750			—		715,750		—
U.S. government agency obligations	190,026			—		190,026		—
	$	922,261		$	8,986	$	913,275	$	—
Other Assets:
Note receivable	$	19,975		$	—	$	—	$	19,975
As of December 31, 2012
Cash Equivalents and Marketable Securities:
Money market funds	$	22,255		$	22,255	$	—	$	—
Certificates of deposit	7,473			7,473		—		—
Commercial paper	9,482			—		9,482		—
Corporate bonds	692,995			—		692,995		—
U.S. government agency obligations	189,674			—		189,674		—
	$	921,879		$	29,728	$	892,151	$	—
Other Liabilities:
Contingent consideration obligation related to Verivue acquisition	$	(1,200	)	$	—	$	—	$	(1,200	)

Schedule of Contractual Maturities of Marketable Securities and Other Investment Related Assets

Contractual maturities of the Company’s available-for-sale marketable securities held at June 30, 2013 and December 31, 2012 were as follows (in thousands):

	June 30, 2013		December 31, 2012
Due in 1 year or less	$	326,077	$	235,592
Due after 1 year through 5 years	587,470		657,659
	$	913,547	$	893,251

FairValueAssetsAndLiabiltiesUnobservableInputReconciliation

The following tables reflect the activity for the Company’s major classes of assets and liabilities measured at fair value using Level 3 inputs for the six months ended June 30, 2013 (in thousands):

	Other Assets: Note Receivable		Other Liabilities: Contingent Consideration Obligation
Balance as of January 1, 2013	$	—	$	(1,200	)
Fair value adjustment to contingent consideration for acquisition of Verivue included in general and administrative expense	—		1,200
Convertible note receivable from divestiture of a business	18,882		—
Unrealized gain on convertible note receivable included in general and administrative expense	1,093		—
Balance as of June 30, 2013	$	19,975	$	—