Cash, Cash Equivalents and Investments (Tables)

6 Months Ended

Jun. 30, 2012

Cash, Cash Equivalents and Investments [Abstract]

Summary of cash and cash equivalents

	As of
	June 30, 2012		December 31, 2011
	(In thousands)
Cash and interest bearing deposits	$	138,912	$	117,500
Money market funds		520,546		484,102
Commercial paper		1,200		—
Bank certificates of deposit		1,000		—
Total cash and cash equivalents	$	661,658	$	601,602

Marketable investment

	As of June 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Corporate debt securities	$	26,101	$	7	$	(24	)	$	26,084
United States government agency securities		2,206		2		—			2,208
United States Treasury securities		17,258		—		(3	)		17,255
Bank certificates of deposit		2,000		—		(5	)		1,995
Commercial paper		1,497		1		—			1,498
Marketable equity securities		1,830		434		—			2,264
Total short-term investments	$	50,892	$	444	$	(32	)	$	51,304

	As of December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Marketable equity securities	$	1,830	$	1,207	$	—	$	3,037
Total short-term investments	$	1,830	$	1,207	$	—	$	3,037

Contractual maturity of marketable debt investments

	Amortized Cost		Fair Value
	(In thousands)
Due in less than one year	$	13,124	$	13,115
Due in one to three years		35,938		35,925
Total marketable debt securities included in short-term investments	$	49,062	$	49,040

Summary of realized gains from sale of available-for-sale securities

	Three Months Ended						Six Months Ended
	June 30, 2012			July 2, 2011			June 30, 2012			July 2, 2011
	(In thousands)						(In thousands)
Gains on sale of marketable equity securities	$	—		$	7,987		$	117		$	8,052
Losses on sale of marketable equity securities		(2	)		(8	)		(2	)		(8	)
Total net gains (losses) on sale of marketable equity securities	$	(2	)	$	7,979		$	115		$	8,044

Amortization of premium or discount related marketable debt investments

	Three Months Ended				Six Months Ended
	June 30, 2012		July 2, 2011		June 30, 2012		July 2, 2011
	(In thousands)				(In thousands)
Amortization of premium (discount)	$	20	$	—	$	20	$	—

Carrying value of non-marketable securities

	As of
	June 30, 2012		December 31, 2011
	(In thousands)
Cost method	$	6,135	$	6,157
Equity method		4,320		4,303
Total non-marketable investments	$	10,455	$	10,460

Net Realized gains on the sale of non-marketable investments

	Three Months Ended				Six Months Ended
	June 30, 2012		July 2, 2011		June 30, 2012		July 2, 2011
	(In thousands)				(In thousands)
Gains on sale of non-marketable investments	$	—	$	108	$	—	$	2,729