Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities

Summary of available-for-sale marketable securities

	June 30, 2013
	Adjusted		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
	(In thousands)
Government/agency bond investments:
Current	$	159,648	$	51	$	(110	)	$	159,589
Total Government/agency bond investments		159,648		51		(110	)		159,589
Corporate debt and other investments:
Current		268,157		88		(445	)		267,800
Non-current	5,675		—		(224		)	5,451
Total corporate debt and other investments		273,832		88		(669	)		273,251
Total available-for-sale marketable securities	$	433,480	$	139	$	(779	)	$	432,840

	December 31, 2012
	Adjusted		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
	(In thousands)
Government/agency bond investments:
Current	$	107,673	$	65	$	—		$	107,738
Total Government/agency bond investments		107,673		65		—			107,738
Corporate debt and other investments:
Current		223,192		269		(7	)		223,454
Non-current	8,575		—		(252		)	8,323
Total corporate debt and other investments		231,767		269		(259	)		231,777
Total available-for-sale marketable securities	$	339,440	$	334	$	(259	)	$	339,515