Cash Equivalents and Investments (Tables)

6 Months Ended

Jul. 01, 2012

Cash Equivalents and Investments [Abstract]

Company's cash equivalents and investments measured at fair value

	Fair Value Measurements as of July 1, 2012
	Level 1			Level 2			Total
	(In thousands)
Cash equivalents:
Money-market funds	$	310,545	(a)	$	—		$	310,545
U.S. government and agency securities		—			2,003	(b)		2,003
Total cash equivalents	$	310,545		$	2,003		$	312,548
Available-for-sale debt securities:
Asset-backed and mortgage-backed securities:
Agency securities	$	—		$	124,603	(b)	$	124,603
Non-agency securities		—			3,135	(b)		3,135
U.S. government and agency securities		13,225	(a)		44,200	(b)		57,425
Corporate debt securities		—			13,777	(b)		13,777
Total short-term investments	$	13,225		$	185,715		$	198,940
Long-term investments in equity securities:
Marketable available-for-sale equity securities	$	2,145	(c)	$	—		$	2,145

	Fair Value Measurements as of December 31, 2011
	Level 1			Level 2			Total
	(In thousands)
Cash equivalents:
Money-market funds	$	674,219	(a)	$	—		$	674,219
Available-for-sale debt securities:
Asset-backed and mortgage-backed securities:
Agency securities	$	—		$	97,408	(b)	$	97,408
Non-agency securities		—			9,989	(b)		9,989
U.S. government and agency securities		5,403	(a)		30,572	(b)		35,975
Corporate debt securities		—			12,272	(b)		12,272
Total short-term investments	$	5,403		$	150,241		$	155,644
Long-term investments in equity securities:
Marketable available-for-sale equity securities	$	1,514	(c)	$	—		$	1,514

(a) The fair value of money-market funds is determined using unadjusted prices in active markets. The fair value of Level 1 U.S. government and agency securities is determined using quoted prices in active markets.

(b) These investments are traded less frequently than Level 1 securities and are valued using inputs that include quoted prices for similar assets in active markets and inputs other than quoted prices that are observable for the asset, such as interest rates, yield curves, prepayment speeds, collateral performance, broker/dealer quotes and indices that are observable at commonly quoted intervals.

(c) The fair value of marketable equity securities is determined using quoted market prices in active markets. These amounts are included within other assets in the condensed consolidated balance sheets.

Company's available-for-sale securities

	July 1, 2012
	Amortized Cost		Gross  Unrealized Gain		Gross  Unrealized Loss			Fair Value
	(In thousands)
Short-term debt securities:
Asset-backed and mortgage-backed securities	$	121,466	$	6,764	$	(492	)	$	127,738
U.S. government and agency securities		56,542		888		(5	)		57,425
Corporate debt securities		13,617		161		(1	)		13,777
Total short-term debt securities	$	191,625	$	7,813	$	(498	)	$	198,940
Long-term marketable equity securities	$	669	$	1,476	$	—		$	2,145

	December 31, 2011
	Amortized Cost		Gross  Unrealized Gain		Gross  Unrealized Loss			Fair Value
	(In thousands)
Short-term debt securities:
Asset-backed and mortgage-backed securities	$	99,884	$	7,891	$	(378	)	$	107,397
U.S. government and agency securities		35,179		799		(3	)		35,975
Corporate debt securities		12,146		153		(27	)		12,272
Total short-term debt securities	$	147,209	$	8,843	$	(408	)	$	155,644
Long-term marketable equity securities	$	669	$	846	$	(1	)	$	1,514

Gross unrealized losses and fair values of the Company's short-term investments

	July 1, 2012
	Less than 12 Months					Greater than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Asset-backed and mortgage-backed securities	$	33,176	$	(473	)	$	1,247	$	(19	)
U.S. government and agency securities		15,356		(5	)		—		—
Corporate debt securities		4,544		(1	)		503		—
Total	$	53,076	$	(479	)	$	1,750	$	(19	)

	December 31, 2011
	Less than 12 Months					Greater than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
Asset-backed and mortgage-backed securities	$	10,645	$	(286	)	$	1,301	$	(92	)
U.S. government and agency securities		3,872		(3	)		—		—
Corporate debt securities		2,375		(27	)		505		—
Total	$	16,892	$	(316	)	$	1,806	$	(92	)

Contractual maturities of available-for-sale debt securities

	Available-For-Sale Debt Securities
	(In thousands)
Due within one year	$	27,998
Due in 1-5 years		47,794
Due in 5-10 years		10,015
Due after 10 years		113,133
Total	$	198,940