Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Assets And Liabilities Measured At Fair Value On A Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis



	As of December 31, 2013		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Assets:
Cash and cash equivalents:
Cash	$	227,528	$	227,528	$	—	$	—
Money market funds	52,823		52,823		—		—
Corporate securities	389		—		389		—
Available-for-sale securities:
Agency securities	454,750		—		454,750		—
Corporate securities	644,091		—		633,801		10,291
Municipal securities	53,756		—		53,756		—
Government securities	157,079		—		157,079		—
Prepaid expenses and other current assets:
Foreign currency derivatives	4,952		—		4,952		—
Total assets	$	1,595,368	$	280,351	$	1,304,727	$	10,291
Accrued expenses and other current liabilities:
Foreign currency derivatives	1,743		—		1,743		—
Total liabilities	$	1,743	$	—	$	1,743	$	—



	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)
	(in thousands)
Assets:
Cash and cash equivalents:
Cash	$	503,614	$	503,614	$	—	$	—
Money market funds	123,519		123,519		—		—
Corporate securities	16,476		—		16,476		—
Available-for-sale securities:
Agency securities	402,707		—		402,707		—
Corporate securities	405,322		—		401,981		3,341
Municipal securities	32,313		—		32,313		—
Government securities	39,993		—		39,993		—
Prepaid expenses and other current assets:
Foreign currency derivatives	4,157		—		4,157		—
Total assets	$	1,528,101	$	627,133	$	897,627	$	3,341
Accrued expenses and other current liabilities:
Foreign currency derivatives	4,162		—		4,162		—
Total liabilities	$	4,162	$	—	$	4,162	$	—

Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs




	Investments
	(in thousands)
Balance at December 31, 2012	$	3,341
Purchases of Level 3 securities	9,700
Transfers out of Level 3	(2,750		)
Balance at December 31, 2013	$	10,291

- 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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