Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Investments All Other Investments [Abstract]

Schedule of Cash, Cash Equivalents and Marketable Securities

The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities as of September 30, 2013 and December 31, 2012 (in thousands):

	September 30, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents(1)		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash (1)	$	231,400	$	—	$	—		$	231,400	$	231,400	$	—	$	—
Level 1:
Money market funds		44,958		—		—			44,958		44,958		—		—
Subtotal		44,958		—		—			44,958		44,958		—		—
Level 2:
U.S. agency securities		38,522		13		(28	)		38,507		—		16,026		22,481
U.S. treasury securities		15,298		1		—			15,299		—		15,299		—
Certificates of deposit		19,200		22		—			19,222		—		16,221		3,001
Commercial paper		999		1		—			1,000		—		1,000		—
Corporate securities		240,755		77		(339	)		240,493		—		102,450		138,043
Municipal securities		5,001		—		—			5,001		—		5,001		—
Subtotal		319,775		114		(367	)		319,522		—		155,997		163,525
Total	$	596,133	$	114	$	(367	)	$	595,880	$	276,358	$	155,997	$	163,525

	December 31, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash	$	141,460	$	—	$	—		$	141,460	$	141,460	$	—	$	—
Level 1:
Money market funds		215,052		—		—			215,052		215,052		—		—
Subtotal		215,052		—		—			215,052		215,052		—		—
Level 2:
U.S. agency securities		13,634		4		(3	)		13,635		—		7,635		6,000
Commercial paper		48,710		15		(22	)		48,703		9,999		38,704		—
Corporate securities		162,050		12		(180	)		161,882		1,004		67,630		93,248
Municipal securities		5,003		—		(2	)		5,001		—		5,001		—
Subtotal		229,397		31		(207	)		229,221		11,003		118,970		99,248
Total	$	585,909	$	31	$	(207	)	$	585,733	$	367,515	$	118,970	$	99,248

(1) Total cash does not include $40.4 million of marketable securities which were sold during the period, but had not yet settled on report date. This amount was recorded to Receivable—sale of marketable securities on our consolidated balance sheet at September 30, 2013. This cash was received on October 1, 2013.

Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments

The following tables show the fair value and notional principal amounts of our outstanding or unsettled derivative instruments that are not designated as hedging instruments (in thousands):

	Balance Sheet Caption	September 30, 2013
		Fair Value of Derivative(2)				U.S. Dollar Notional
		Asset		Liability
Foreign exchange-forward contracts (current)	Accrued and other current liabilities (1)	$	—	$	160	$	6,604

	Balance Sheet Caption	December 31, 2012
		Fair Value of Derivative(2)				U.S. Dollar Notional
		Asset		Liability
Foreign exchange-forward contracts (current)	Accrued and other current liabilities (1)	$	—	$	64	$	2,710

(1) Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. dollar.

(2) The fair value of our derivatives are measured using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.