Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Marketable Securities [Abstract]

Schedule of Marketable Securities

The following is a summary of available-for-sale marketable securities held as of March 31, 2014 and December 31, 2013 (in thousands):

			Gross Unrealized							Classification Balance Sheet
	Amortized Cost		Gains		Losses			Aggregate Fair Value		Short-Term Marketable Securities		Long-Term Marketable Securities
As of March 31, 2014
Certificates of deposit	$	225	$	—	$	—		$	225	$	172	$	53
Commercial paper	24,986		—		(12		)	24,974		24,974		—
Corporate bonds	874,265		1,087		(1,161		)	874,191		358,887		515,304
U.S. government agency obligations	271,705		14		(434		)	271,285		65,371		205,914
	$	1,171,181	$	1,101	$	(1,607	)	$	1,170,675	$	449,404	$	721,271
As of December 31, 2013
Certificates of deposit	$	222	$	—	$	—		$	222	$	173	$	49
Corporate bonds	736,945		1,197		(281		)	737,861		278,318		459,543
U.S. government agency obligations	174,982		51		(85		)	174,948		61,514		113,434
	$	912,149	$	1,248	$	(366	)	$	913,031	$	340,005	$	573,026

Schedule of Fair Value Measurement

The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liability at March 31, 2014 and December 31, 2013 (in thousands):

	Total Fair Value			Fair Value Measurements at Reporting Date Using
				Level 1		Level 2		Level 3
As of March 31, 2014
Cash Equivalents and Marketable Securities:
Money market funds	$	21,401		$	21,401	$	—	$	—
Certificates of deposit	225			225		—		—
Commercial paper	48,471			—		48,471		—
Corporate bonds	876,199			—		876,199		—
U.S. government agency obligations	271,285			—		271,285		—
	$	1,217,581		$	21,626	$	1,195,955	$	—
Other Assets:
Note receivable	$	23,245		$	—	$	—	$	23,245
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition	$	(2,600	)	$	—	$	—	$	(2,600	)
As of December 31, 2013
Cash Equivalents and Marketable Securities:
Money market funds	$	40,482		$	40,482	$	—	$	—
Certificates of deposit	3,418			3,418		—		—
Commercial paper	29,999			—		29,999		—
Corporate bonds	737,861			—		737,861		—
U.S. government agency obligations	174,948			—		174,948		—
	$	986,708		$	43,900	$	942,808	$	—
Other Assets:
Note receivable	$	22,879		$	—	$	—	22,879
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition	$	(2,600	)	$	—	$	—	$	(2,600	)

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 March 31, 2014 and December 31, 2013 were as follows (in thousands):

	March 31, 2014		December 31, 2013
Due in 1 year or less	$	449,404	$	340,005
Due after 1 year through 5 years	721,271		573,026
	$	1,170,675	$	913,031

Schedule of Fair Value Assets and Liabilities Unobservable Input Reconciliation

The following table reflects the activity for the Company’s major classes of assets and liabilities measured at fair value using Level 3 inputs for the three months ended March 31, 2014 (in thousands):

	Other Assets: Note Receivable		Other Liabilities: Contingent Consideration Obligation
Balance as of January 1, 2014	$	22,879	$	(2,600	)
Unrealized gain on convertible note receivable included in other comprehensive income	366		—
Balance as of March 31, 2014	$	23,245	$	(2,600	)